We don’t normally do author biographies here, but in this case it’s worth noting that Dr. Su is a physiotherapist, military rehab expert, and an IAYT yoga therapist. So, these things together certainly do lend weight to his advice.
About the “6-minute” thing: this is in the style of the famous “7-minute workout” and “5 Minutes’ Physical Fitness” etc, and refers to how long each exercise session should take. The baseline is one such session per day, though of course doing more than one set of 6 minutes each time is a bonus if you wish to do so.
The exercises are focused on core strength, but they also include hip and shoulder exercises, since these are after all attached to the core, and hip and shoulder mobility counts for a lot.
A particular strength of the book is in troubleshooting mistakes of the kind that aren’t necessarily visible from photos; in this case, Dr. Su explains what you need to go for in a certain exercise, and how to know if you are doing it correctly. This alone is worth the cost of the book, in this reviewer’s opinion.
Bottom line: if you want core strength and want it simple yet comprehensive, this book can guide you.
Click here to check out 6-Minute Core Strength, and strengthen yours!