Left Movie Clip: The man's habitual standing straight leg raise. Note how the lower right of the Pilates box shortens and twists forward upon the forward swing.


Habitual Straight Leg Raise, with the right lower side of the 
Pilates Box shortening and twisting forward.
Right Movie Clip: Straight Leg Raise while Relaxing and Lengthening the right side of the Pilates Box. (Note that there is still a problem with the right side of the Pilates Box sagging upon the back swing).

Straight leg raise while relaxing and lengthening 
the right side of the Pilates Box