crunch 1
side 1




Place feet next to each other (if beginner, stay on knees) and hold either side of a Reebok Core Board.

Keep your wrist line straight with arm. Press up into a push-up position.



Keep your back flat, in a straight line from head to heels.

Tilt your hips and contract your belly tightly to prevent your rear end from sticking up in the air, keeping good quality posture.

Begin to twist the Reebok Core Board to the left at far as possible without shifting your body. The arms stay straight.

Using your core, the torso should remain frozen while you begin to transfer directions to the right.

Shift Left to Right rapidly 20-60" until your form begins to fail in any way.