This is a great exercise for the lower back.
Lie in a prone position over the BOSU with your knees bent or straight, toes tucked under. Start with your forehead close to the floor - keep looking at the floor throughout the exercise. Keep your hands near your ears, and pull your shoulder blades together and down toward your buttocks.
Exhale and lift your right elbow and shoulder up toward the ceiling. Inhale and return to the start position. Repeat on the left. Keep your navel pulled in and avoid hyperextension of the low back. Repeat 5-8 times to each side, rest, then repeat the entire exercise if desired.
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