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Standard sit-ups not enough? A "double crunch" engages your entire abdomen and works on your balance and fitness because you are raising your shoulders and hips off the floor at once. Start out lying on your back on a mat or carpet with your arms and legs extended firmly towards the ceiling. Inhale deeply, and while exhaling, raise your shoulders and hips off the floor at the same time, pushing your feet towards the ceiling and reach your hands towards your toes. Only the low and middle back remain on the floor. Slowly unroll and lower to the starting position. Go slowly, and don't try to use momentum, and rest as needed when your arms and legs get tired. Work up to as many as 40 repetitions.