Most effective ab exercises include a curl-up, but the height of the curl is what defines which muscles are working. A high curl targets your lower abs, while a low curl focuses on the upper abs. Here are variations for both high and low curls to sculpt your core.

High Curl
Sitting up, place the ball between your upper thighs. Pull behind your knees with your fingertips as you inch your heels closer to your seat. Then roll your lower back down toward the floor and use your abs to lift your chest closer to the ball. Complete 15-20 reps.

For your sides or obliques: Take the ball out from your legs and tightly press your thighs together. Pressing into the ball with your palms, twist your elbows from right to left. Repeat 10 times on each side.

See three ways to do a low curl after the break!
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