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Many people may regard this as strength training, but in actuality, this is not realy a demonstration of maximal strength but some excellent joint preparation procedures I also use extensivly in my own practice.
Many good techniques for joint prep exist in traditional martial arts, most of them reflect a need for great joint integrity for the practice of those systems.
If you are inspired to begin to use this in your warm-up and cool-downs, make sure to use proper progressions and not start too intensly. The same preparatory procedures can result in some fantastic injuries, stay safe.
Ido.