Reverse Crunch
Sit on the floor with your knees up, lean back slightly and support yourself with your hands. Place the ball between your knees and hold tight. Slowly bring your knees towards your chest, keep a cricket ball sized gap between your chin and upper chest. Repeat.
Crossover twist
Lie on the floor, knees bent and flat against the floor, hold the ball in front of your chest, bring your right elbow up to your left knee as you contract your abs and raise your shoulders of the floor, repeat with other side.
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