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Lie on the floor with your calves on top of a fitness ball, arms to the sides, palms facing up. Squeeze your glutes and raise your hips until your body forms a straight line from your shoulders to your feet. Bend your knees to roll the ball towards you, straighten your legs to roll it back, then lower to the start position. That’s one rep. Do 10 to 12.
Photo by Women's Health Mar 22, 2011