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Rest your upper back on a stability ball and cross your left leg over your right knee (a). Lower your hips toward the floor (b). Pause, then press through your heel to return to start. That's one rep. Do eight to 12, then repeat on the other side.
"Most people think a stability ball is just for strengthening their core, but training with a ball can tone muscles throughout the entire body," says personal trainer and fitness author Larysa DiDio. "It also improves flexibility, balance, posture, and coordination."
Plank shoulder taps. Get into a plank position with your knees on your smith ball. Slowly balance on one hand and tap your shoulder, then follow on the other hand. Try 3 sets of 10. For added difficulty balance the ball on your ankles. Make sure your back is 'set' meaning that your back is straight with no arch in it.