Place your legs up on to the swiss ball and your hands on the ground, keeping your torso in a plank like position. Straddle the ball between your lower legs, to securely grip the ball. Whilst keeping your arms locked, twist your torso and legs to one side, until your toes almost touch the floor, then repeat the twist in the opposite direction.
Tip: To increase the difficulty of this exercise, increase the speed of your twists.
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