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How-to: Plank Tuck with a Twist
Lie facedown on the ball with your hands on the floor in front of you. Walk your hands forward until you are in plank position (the "up" part of a push-up) with only your shins and tops of your feet on the ball (A). Brace your core and bring your knees in, pivoting them sideways so they come toward your right armpit (B). Shoot your legs back out to plank position, then repeat on left side; that's 1 rep. Do 10 reps
No gym or ball? Do the move on a smooth floor with your feet on a kitchen towel or paper plate that will allow them to slideyou'll still have to work your core big-time to bring your knees in.
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