Impressive display of leverage, control, flexibility and strength. Also lower body movements (not shown) can be exceptional also. Static holds do much to increase overall body strength, which is part of these workouts. Even in lifting, static holds can be an important part of training.
Seen a few women and some kids accomplish movements like most of those in the clip. Athletic by anyone's measure.
Soreness goes with the beginning, but does not have to be major, by any means. Stretching, before and after a workout can help. Even light, short workouts the next day can reduce any soreness, mostly focused of stretch and flexibility.
Good Luck.
