rotational crunch - bicycle

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1. Lie face up on the ground with your hands behind your head, one leg straight and lifted 3 to 4 inches off the ground, the opposite hip and knee bent to 90 degrees each. 2. Curl your torso and pelvis toward each other, rotating your torso toward the bent leg. 3. Repeat the move by rotating your torso toward the opposite side, straightening the bent leg, and bending the straight hip and knee to 90 degrees each. 4. Continue alternating to complete the set. Be sure to: Keep your belly button drawn in, stomach tight, and neck relaxed. You should feel it: Working your abdominals.