Rollups shape and develop the back of your legs and your calves. This is also an excellent exercise to strengthen your core. Lay down flat on your back, extend your legs and place a therapeutic ball under your heels. This is your starting position. Pick your hips up off the floor and pull the ball toward your butt with your feet as far as possible and then slowly return to the starting position. Breathing pattern for this exercise is to exhale while rolling the ball towards you and to inhale when returning to the starting position.
