Dec 26, 2009 7:12 AM:
Completely extend your head over the ball to your body forms an upside-down U on the ball before contracting the abs. Giving your abs a full range of motion will make this exercise more effective.
Completely extend your head over the ball to your body forms an upside-down U on the ball before contracting the abs. Giving your abs a full range of motion will make this exercise more effective. -See Less
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Dec 26, 2009 7:12 AM: Completely extend your head over the ball to your body forms an upside-down U on the ball before contracting the abs. Giving your abs a full range of motion will make this exercise more effective.