What is PNF stretching, and will it improve my flexibility?
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Whether improving your flexibility was one of your new year’s resolutions, or you’ve been inspired watching certain tennis stars warming up at the Australian Open, maybe 2025 has you keen to focus on regular stretching.
However, a quick Google search might leave you overwhelmed by all the different stretching techniques. There’s static stretching and dynamic stretching, which can be regarded as the main types of stretching.
But there are also some other potentially lesser known types of stretching, such as PNF stretching. So if you’ve come across PNF stretching and it piques your interest, what do you need to know?
What is PNF stretching?
PNF stretching stands for proprioceptive neuromuscular facilitation. It was developed in the 1940s in the United States by neurologist Herman Kabat and physical therapists Margaret Knott and Dorothy Voss.
PNF stretching was initially designed to help patients with neurological conditions that affect the movement of muscles, such as polio and multiple sclerosis.
By the 1970s, its popularity had seen PNF stretching expand beyond the clinic and into the sporting arena where it was used by athletes and fitness enthusiasts during their warm-up and to improve their flexibility.
Although the specifics have evolved over time, PNF essentially combines static stretching (where a muscle is held in a lengthened position for a short period of time) with isometric muscle contractions (where the muscle produces force without changing length).
PNF stretching is typically performed with the help of a partner.
There are 2 main types
The two most common types of PNF stretching are the “contract-relax” and “contract-relax-agonist-contract” methods.
The contract-relax method involves putting a muscle into a stretched position, followed immediately by an isometric contraction of the same muscle. When the person stops contracting, the muscle is then moved into a deeper stretch before the process is repeated.
For example, to improve your hamstring flexibility, you could lie down and get a partner to lift your leg up just to the point where you begin to feel a stretch in the back of your thigh.
Once this sensation eases, attempt to push your leg back towards the ground as your partner resists the movement. After this, your partner should now be able to lift your leg up slightly higher than before until you feel the same stretching sensation.
This technique was based on the premise that the contracted muscle would fall “electrically silent” following the isometric contraction and therefore not offer its usual level of resistance to further stretching (called “autogenic inhibition”). The contract-relax method attempts to exploit this brief window to create a deeper stretch than would otherwise be possible without the prior muscle contraction.
The contract-relax-agonist-contract method is similar. But after the isometric contraction of the stretched muscle, you perform an additional contraction of the muscle group opposing the muscle being stretched (referred to as the “agonist” muscle), before the muscle is moved into a static stretch once more.
Again, if you’re trying to improve hamstring flexibility, immediately after trying to push your leg towards the ground you would attempt to lift it back towards the ceiling (this bit without partner resistance). You would do this by contracting the muscles on the front of the thigh (the quadriceps, the agonist muscle in this case).
Likewise, after this, your partner should be able to lift your leg up slightly higher than before.
The contract-relax-agonist-contract method is said to take advantage of a phenomenon known as “reciprocal inhibition.” This is where contracting the muscle group opposite that of the muscle being stretched leads to a short period of reduced activation of the stretched muscle, allowing the muscle to stretch further than normal.
What does the evidence say?
Research has shown PNF stretching is associated with improved flexibility.
While it has been suggested that both PNF methods improve flexibility via changes in nervous system function, research suggests they may simply improve our ability to tolerate stretching.
It’s worth noting most of the research on PNF stretching and flexibility has focused on healthy populations. This makes it difficult to provide evidence-based recommendations for people with clinical conditions.
And it may not be the most effective method if you’re looking to improve your flexibility in the long term. A 2018 review found static stretching was better for improving flexibility compared to PNF stretching. But other research has found it could offer greater immediate benefits for flexibility than static stretching.
At present, similar to other types of stretching, research linking PNF stretching to injury prevention and improved athletic performance is relatively inconclusive.
PNF stretching may actually lead to small temporary deficits in performance of strength, power, and speed-based activities if performed immediately beforehand. So it’s probably best done after exercise or as a part of a standalone flexibility session.
How much should you do?
It appears that a single contract-relax or contract-relax-agonist-contract repetition per muscle, performed twice per week, is enough to improve flexibility.
The contraction itself doesn’t need to be hard and forceful – only about 20% of your maximal effort should suffice. The contraction should be held for at least three seconds, while the static stretching component should be maintained until the stretching sensation eases.
So PNF stretching is potentially a more time-efficient way to improve flexibility, compared to, for example, static stretching. In a recent study we found four minutes of static stretching per muscle during a single session is optimal for an immediate improvement in flexibility.
Is PNF stretching the right choice for me?
Providing you have a partner who can help you, PNF stretching could be a good option. It might also provide a faster way to become more flexible for those who are time poor.
However, if you’re about to perform any activities that require strength, power, or speed, it may be wise to limit PNF stretching to afterwards to avoid any potential deficits in performance.
Lewis Ingram, Lecturer in Physiotherapy, University of South Australia and Hunter Bennett, Lecturer in Exercise Science, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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We looked at 700 plant-based foods to see how healthy they really are. Here’s what we found
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If you’re thinking about buying plant-based foods, a trip to the supermarket can leave you bewildered.
There are plant-based burgers, sausages and mince. The fridges are loaded with non-dairy milk, cheese and yoghurt. Then there are the tins of beans and packets of tofu.
But how much is actually healthy?
Our nutritional audit of more than 700 plant-based foods for sale in Australian supermarkets has just been published. We found some products are so high in salt or saturated fat, we’d struggle to call them “healthy”.
We took (several) trips to the supermarket
In 2022, we visited two of each of four major supermarket retailers across Melbourne to collect information on the available range of plant-based alternatives to meat and dairy products.
We took pictures of the products and their nutrition labels.
We then analysed the nutrition information on the packaging of more than 700 of these products. This included 236 meat substitutes, 169 legumes and pulses, 50 baked beans, 157 dairy milk substitutes, 52 cheese substitutes and 40 non-dairy yoghurts.
Plant-based meats were surprisingly salty
We found a wide range of plant-based meats for sale. So, it’s not surprising we found large variations in their nutrition content.
Sodium, found in added salt and which contributes to high blood pressure, was our greatest concern.
The sodium content varied from 1 milligram per 100 grams in products such as tofu, to 2,000mg per 100g in items such as plant-based mince products.
This means we could eat our entire daily recommended sodium intake in just one bowl of plant-based mince.
An audit of 66 plant-based meat products in Australian supermarkets conducted in 2014 found sodium ranged from 316mg in legume-based products to 640mg in tofu products, per 100g. In a 2019 audit of 137 products, the range was up to 1,200mg per 100g.
In other words, the results of our audit seems to show a consistent trend of plant-based meats getting saltier.
Looking for plant-based meat? Check the label for the sodium content.
Michael Vi/Shutterstock
What about plant-based milks?
Some 70% of the plant-based milks we audited were fortified with calcium, a nutrient important for bone health.
This is good news as a 2019-2020 audit of 115 plant-based milks from Melbourne and Sydney found only 43% of plant-based milks were fortified with calcium.
Of the fortified milks in our audit, almost three-quarters (73%) contained the recommended amount of calcium – at least 100mg per 100mL.
We also looked at the saturated fat content of plant-based milks.
Coconut-based milks had on average up to six times higher saturated fat content than almond, oat or soy milks.
Previous audits also found coconut-based milks were much higher in saturated fat than all other categories of milks.
Some plant-based milks were healthier than others.
TY Lim/Shutterstock
A first look at cheese and yoghurt alternatives
Our audit is the first study to identify the range of cheese and yoghurt alternatives available in Australian supermarkets.
Calcium was only labelled on a third of plant-based yoghurts, and only 20% of supermarket options met the recommended 100mg of calcium per 100g.
For plant-based cheeses, most (92%) were not fortified with calcium. Their sodium content varied from 390mg to 1,400mg per 100g, and saturated fat ranged from 0g to 28g per 100g.
So, what should we consider when shopping?
As a general principle, try to choose whole plant foods, such as unprocessed legumes, beans or tofu. These foods are packed with vitamins and minerals. They’re also high in dietary fibre, which is good for your gut health and keeps you fuller for longer.
If opting for a processed plant-based food, here are five tips for choosing a healthier option.
1. Watch the sodium
Plant-based meat alternatives can be high in sodium, so look for products that have around 150-250mg sodium per 100g.
2. Pick canned beans and legumes
Canned chickpeas, lentils and beans can be healthy and low-cost additions to many meals. Where you can, choose canned varieties with no added salt, especially when buying baked beans.
3. Add herbs and spices to your tofu
Tofu can be a great alternative to meat. Check the label and pick the option with the highest calcium content. We found flavoured tofu was higher in salt and sugar content than minimally processed tofu. So it’s best to pick an unflavoured option and add your own flavours with spices and herbs.
4. Check the calcium
When choosing a non-dairy alternative to milk, such as those made from soy, oat, or rice, check it is fortified with calcium. A good alternative to traditional dairy will have at least 100mg of calcium per 100g.
5. Watch for saturated fat
If looking for a lower saturated fat option, almond, soy, rice and oat varieties of milk and yoghurt alternatives have much lower saturated fat content than coconut options. Pick those with less than 3g per 100g.
Laura Marchese, PhD Student at the Institute for Physical Activity and Nutrition, Deakin University and Katherine Livingstone, NHMRC Emerging Leadership Fellow and Senior Research Fellow at the Institute for Physical Activity and Nutrition, Deakin University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Ageless – by Dr. Andrew Steele
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So, yet another book with “The new science of…” in the title; does this one deliver new science?
Actually, yes, this time! The author was originally a physicist before deciding that aging was the number one problem that needed solving, and switched tracks to computational biology, and pioneered a lot of research, some of the fruits of which can be found in this book, in amongst a more general history of the (very young!) field of biogerontology.
Downside: most of this is not very practical for the lay reader; most of it is explanations of how things happen on a cellular and/or genetic level, and how we learned that. A lot also pertains to what we can learn from animals that either age very slowly, or are biologically immortal (in other words, they can still be killed, but they don’t age and won’t die of anything age-related), or are immune to cancer—and how we might borrow those genes for gene therapy.
However, there are also chapters on such things as “running repairs”, “reprogramming aging”, and “how to live long enough to live even longer”.
The style is conversational pop science; in the prose, he simply states things without reference, but at the back, there are 40 pages of bibliography, indexed in the order in which they occurred and prefaced with the statement that he’s referencing in each case. It’s an odd way to do citations, but it works comfortably enough.
Bottom line: if you’d like to understand aging on the cellular level, and how we know what we know and what the likely future possibilities are, then this is a great book; it’s also simply very enjoyable to read, assuming you have an interest in the topic (as this reviewer does).
Click here to check out Ageless, and understand the science of getting older without getting old!
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Slow-Cooker Moroccan Tagine
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Tagine (طاجين) (tā-jīn) is a traditional dish named after, well, the traditional dish that it’s cooked in. Here’s an example tagine pot on Amazon. It’s a very nifty bit of kit, and while it’s often used for cooking over charcoal, one of its features is that if you have a hot sunny day, you can just leave it out in the sun and it will cook the contents nicely. Today though, we’re going to assume you don’t have one of these, and are going to give instructions for cooking a tagine-style dish with a slow cooker, which we’re going to assume you do have.
You will need
- 2 large red onions, finely chopped
- 2 large red peppers, cut into 1″ chunks
- 2 large zucchini, cut into ½” chunks
- 1 large eggplant, cut into ½” chunks
- 3 cups tomato passata
- 2 cups cooked chickpeas
- 16 pitted Medjool dates, chopped
- ½ bulb garlic, finely chopped
- 1 tbsp ras el-hanout
- A little extra virgin olive oil
Method
(we suggest you read everything at least once before doing anything)
1) Let your slow cooker heat up while you chop the things that need chopping
2) Add a splash of olive oil to the slow cooker; ensure the base is coated and there’s a little oil spare in there too; a thin coat to the base plus a couple of tbsp should do it nicely.
3) Add the onions and garlic, and leave for an hour.
4) Add the passata, dates, ras el-hanout, stir it and leave for an hour.
5) Add the chickpeas, peppers, and eggplant; stir it and leave for an hour.
6) Add the zucchini, stir it and leave for an hour.
7) Serve—it goes great with its traditional pairing of wholegrain couscous, but if you prefer, you can use our tasty versatile rice. In broader culinary terms, serving it with any carb is fine.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)
- What Matters Most For Your Heart? Eat More (Of This) For Lower Blood Pressure
- Our Top 5 Spices: How Much Is Enough For Benefits?
Take care!
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The Dopamine Myth
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The Dopamine Myth
There’s a popular misconception that, since dopamine is heavily involved in addictions, it’s the cause.
We see this most often in the context of non-chemical addictions, such as:
- gambling
- videogames
- social media
And yes, those things will promote dopamine production, and yes, that will feel good. But dopamine isn’t the problem.
Myth: The Dopamine Detox
There’s a trend we’ve mentioned before (it got a video segment a few Fridays back) about the idea of a “dopamine detox“, and how unscientific the idea is.
For a start…
- You cannot detox from dopamine, because dopamine is not a toxin
- You cannot abstain from dopamine, because your brain regulates your dopamine levels to keep them correct*
- If you could abstain from dopamine (and did), you would die, horribly.
*unless you have a serious mental illness, for example:
- forms of schizophrenia and/or psychosis that involve too much dopamine, or
- forms of depression and/or neurodegenerative diseases such as Parkinson’s (and several kinds of dementia) in which you have too little dopamine
- bipolar disorder in which dopamine levels can swing too far each way
See also: Dopamine fasting: misunderstanding science spawns a maladaptive fad
Myth: Dopamine is all about pleasure
Dopamine is a pleasure-giving neurotransmitter, but it serves more purposes than that! It also plays a central role in many neurological processes, including:
- Motivation
- Learning and memory
- Motor functions
- Language faculties
- Linear task processing
Note for example how someone taking dopaminergic drugs (prescription or otherwise; could be anything from modafinil to cocaine) is not blissed out… They’re probably in a good mood, sure, but they’re focused, organized, quick-thinking, and so forth! This is not an ad for cocaine; cocaine is very bad for the health. But you see the features? So, what if we could have a little more dopamine… healthily?
Dopamine—à la carte
Let’s look at the examples we gave earlier of non-chemical addictions that are dopaminergic in nature:
- gambling
- videogames
- social media
They’re not actually that rewarding, are they?
- Gamblers lose more than they win
- Gamers cease to care about a game once they have won
- Social media more often results in “doomscrolling”
This is because what prompts the most dopamine is actually the anticipation of reward… not the thing itself, whose reward-pleasure is very fleeting. Nobody looks back at an hour of doomscrolling and thinks “well, that was fun; I’m glad I did that”.
See the science: Liking, Wanting and the Incentive-Sensitization Theory of Addiction
But what if we anticipated a reward from things that are not deleterious to health and productivity? Things that are neutral, or even good for us?
Examples of this include:
- Sex! (remember though, it’s not a race to the finish-line)
- Good, nourishing food (bonus: some foods boost dopamine production nutritionally)
- Exercise/sport (also prompts release of endorphins, win/win!)
- Gamified learning apps (e.g. Duolingo)
- Gamified health/productivity apps (anything with bells and whistles and things that go “ding” and measure streaks etc)
Want to know more?
That’s all we have time for today, but you might want to check out:
10 Best Ways to Increase Dopamine Levels Naturally ← Science-based and well-sourced article!
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Try This At Home: ABI Test For Clogged Arteries
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Arterial plaque is a big deal, and statistically it’s more of a risk as we get older, often coming to a head around age 72 for women and 65 for men—these are the median ages at which people who are going to get heart attacks, get them. Or get it, because sometimes one is all it takes.
The Ankle-Brachial Index Test
Dr. Brewer recommends a home test for detecting arterial plaque called the Ankle-Brachial Index (ABI), which uses a blood pressure monitor. The test involves measuring blood pressure in both the arms and ankles, then calculating the ratio of these measurements:
- A healthy ABI score is between 1.0 and 1.4; anything outside this range may indicate arterial problems.
- Low ABI scores (below 0.8) suggest plaque is likely obstructing blood flow
- High ABI scores (above 1.4) may indicate artery hardening
Peripheral Artery Disease (PAD), associated with poor ABI results (be they high or low), can cause a whole lot of problems that are definitely better tackled sooner rather than later—remember that atherosclerosis is a self-worsening thing once it gets going, because narrower walls means it’s even easier for more stuff to get stuck in there (and thus, the new stuff that got stuck also becomes part of the walls, and the problem gets worse).
If you need a blood pressure monitor, by the way, here’s an example product on Amazon.
Do note also that yes, if you have plaque obstructing blood flow and hardened arteries, your scores may cancel out and give you a “healthy” score, despite your arteries being very much not healthy. For this reason, this test can be used to raise the alarm, but not to give the “all clear”.
For more on all of the above, plus a demonstration and more in-depth explanation of the test, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
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Keep Cellulite At Bay
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small 😎
❝Does anything actually get rid of cellulite? Nothing seems to❞
Let’s get the bad news over with in one go:
Nothing (that the scientific world currently knows of) can get rid of cellulite permanently, nor completely guard against it proactively. Which, given that it affects up to 98% of women to some degree, and often shows up not long after puberty (though it can appear at any time and often increases later in life), any pre-emptive health regime would need to be started as a child in any case.
As with many things that predominantly affect women, the world of medicine isn’t entirely sure what causes it, let alone how to effectively treat it.
Obviously hormones are implicated, namely estrogen.
Obviously adiposity is implicated, because one can’t have dimples in one’s fat if one doesn’t have enough fat to dimple.
Other hypothesized contributory factors include genetics, poor diet, inactivity, unhealthy lifestyle (in ways not previously mentioned, e.g. use of alcohol, tobacco, etc), accumulated toxins, and pregnancy.
Here’s an old paper (from 2004); today’s reviews say pretty much the same thing, but we love how succinctly (albeit, somewhat depressingly) this abstract states how little we know and how little we can do:
Cellulite: a review of its physiology and treatment
However, all is not lost!
There are some things that can affect how much cellulite we get, and there are some things that can reduce it, and even some things that can get rid of it completely—albeit temporarily.
First, a quick refresher on what it actually is, physiologically speaking: cellulite occurs when connective tissue bands pull the skin down in places, where fat tissue has been able to squeeze through. One of the reasons it is hypothesized women get this more than men is because our fat is not merely different in distribution and overall percentage, but also in how the fat cells stack up; we generally have have of a vertical stacking structure going on, while men generally have a more horizontal structure. This means that it can be easier for ours to get moved about differently, causing the connective tissue to pull on the skin unevenly in places.
With that in mind…
Prevention is, as we say, probably impossible if your body is running on estrogen. However, those contributory factors we mentioned above? Most of those are modifiable, including these things that it is hypothesized can reduce it:
Diet: as it seems to be worsened by inflammation (what isn’t?), an anti-inflammatory diet is recommended.
Exercise: there are three things here: 1) exercises to improve circulation and thus the body’s ability to sort things out by itself 2) HIIT exercise to reduce body fat percentage, if one has a high enough starting body fat percentage for that to be a healthy goal 3) mobility exercises, to ensure our connective tissues are the right amount of mobile.
Creams and lotions
These reduce the superficial appearance of cellulite, without actually treating the thing itself. Mostly they are caffeine-based, which when used topically increases blood flow and works as a local diuretic, reducing the water content of the fat cells, diminishing the appearance of the cellulite by making each fat cell physically smaller (while still containing the same amount of fat, and it’ll bounce back in size as soon as the body can restore osmotic balance).
Medical procedures
There are too many of these to discuss them all separately, but they all work on the principle of breaking up the tough bands of connective tissue to eliminate the dimpling of cellulite.
The methods they use vary from ultrasound to cryolipolysis to lasers to “vacuum-assisted precise tissue release”, which involves a suction pump and a multipronged robotic assembly with needles to administer anaesthetic as it goes and small blades to cut the connective tissues under the skin:
Tissue Stabilized–Guided Subcision for the Treatment of Cellulite
That last one definitely sounds like the least fun, but it’s also the only one that doesn’t take months to maybe see results.
Cellulite can and almost certainly will come back after all of these.
Home remedies
Aside from at-home versions of the above (not the robots with vacuum pumps and needles and microblades, hopefully, but for example homemade caffeine creams), and of course diet and exercise which can be considered “home remedies”, there are two more things worth mentioning:
Dry brushing: using a body brush to, as the name suggests, simply brush one’s skin. The “dry” aspect here is simply that it’s not done in the bath or shower; it’s done while dry. It can improve local circulation of blood and lymph, allowing for better detoxification and redistribution of needed bodily resources.
Here’s an example dry brushing body brush on Amazon; this writer has one and hates it, but I’ve also tried with other kinds of brush and hate them too, so it seems to be a me thing rather than a brush thing, and I have desisted in trying, now. Maybe you will like it better; many people do.
Self-massage: or massage by someone else, if that’s an option for you and you prefer. In this case, it works by a different mechanism than dry brushing; this time it’s working by the same principle as the medical techniques described in the previous section; it’s physically breaking down the toughened bits of connective tissue.
Here’s an example wooden massage roller on Amazon; this writer has one and loves it; it’s sooooooo good. I got it as a matter of general maintenance for my fascia, but it’s also very good if I get a muscular pain now and again. As for cellulite, I personally get just a little cellulite sometimes (in the backs of my thighs), and whenever I use this regularly, it goes away for at least a while.
A quick note in closing
Cellulite is normal for women and is not unhealthy. Much like gray hair for example, it’s something that can be increased by poor health, but the thing itself isn’t intrinsically unhealthy, and most of us get it to some degree at some point.
Nevertheless, aesthetic factors can also have a role to play in mental health, and we tend to feel best when we like the way our body looks. If for you that means wanting less/no cellulite, then the above are some ways towards that.
As a bonus, most of the nonmedical options are directly good for the physical health anyway, so doing them is of course good.
In particular that last one (the wooden massage roller), because that connective tissue we talked about? It matters for a lot more than just cellulite, and is heavily implicated in a lot of kinds of chronic pain, so it pays to keep it in good health:
Fascia: Why (And How) You Should Take Care Of Yours
(that article, also written by this same writer by the way, suggests a vibrating foam roller—those are very popular; I just really love my wooden one, and find it more effective)
Take care!
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