Wednesday Form: Box Jumps

Proper Box Jumps:
Clip 1: For speed, in order to count, the jump must end with hips extended (ie, pushing off the box to hip extension in the air). This would be acceptable, and in many cases preferable to achieve adequate intesity (moving mass far and fast).
Clip 2: Slower (doing less work/intensity), the hip extension may occur on top of the box. These jumps, of course, would count.
Clip 3: No hip extension. These jumps would not count. Though hurried, they lack full movement.

(Special thanks to Tennis Karen for lending her athletic prowess!)