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How to do a scissors twist with an exercise ball
Put your exercise ball in an open space.
Make sure there's nothing nearby that could distract or hurt you as you exercise.
Lie down on your back with one of your legs on top of the ball and the other right next to it on the ground.
Prop yourself up slightly on your elbows so that you're looking at the ball, with your hands pressed palm-down to the ground. Squeeze the ball between your lower legs/ankles and lift it up from the ground.