that's a great exercise. Wall Squats.

I usually put them at the end of my leg workout ... I squat down, and then hold myself at the parallell position until my legs shake and shake ... until I can't hold myself up anymore. Then I just sit down and rest. LOL.

I do it without the ball, and I just slide down against the wall ... but whatever works, DO IT!

I see people doing it with the ball at the gym all the time ...