5. Ab Wheel Roll-outs

Abdominal bike rollouts are a great addition to your no-crunch abdominal muscle workout, especially if you’re trying to strengthen your back at the same time. Kneel on the floor and hold the belly wheel in your hands. Place it directly under your shoulders on the floor. Tighten your body center and then roll forward until your center of the body feels like you’re losing the tension. Before your shape breaks, stop and roll up again.

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