Team Schwaller

Work out balls problem by putting your system in an unstable ecosystem. If you lie within the ball, your legs and abs quickly agreement to help keep you from falling off. Add an physical exercise to that (like a chest press or maybe a crunch), and you've just greater the intensity from the movement.
Lie on your own again, calves and hamstrings pressed versus the workout ball and arms spread out. Squeeze the ball with your legs and roll your knees towards your chest then roll again down following a quick pause. In order to avoid straining your neck, look straight ...