Want Rihanna’s Rock Hard Abs?

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Full-Range Sit-Up

“Start with your back on the floor with your heels secure, shoulder width apart. Leading with your chest up towards the ceiling, use the spine as it is in neutral position. Drive all the way up with your chest and once you reach your knees, extend your arms up and straight overhead. Your shoulders should be directly over your hips. Complete 32 reps.”

(Photo: Lockerz.com)

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