The Joy Workout

Have a ball getting fit with these mood-boosting, body-sculpting moves.
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Knees In

Place your shins and the tops of your feet on a stability ball, with your hands on the ground in plank position. Pull your knees in toward your belly (shown), then straighten your legs again. (Or, for more of a challenge, raise your butt into the air to form an upside-down V shape.) That’s 1 rep; do 10–15 reps.

Next: Superman Lifts

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