Women's Health

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Place a rolled bath towel under your lower back as you lie on the floor. Bend knees to 90 degrees, keeping feet flat and fingers behind ears. Crunch up as high as you can while pressing your lower back into the towel. Pause at the top for 2 seconds and repeat. New Results: The towel extends your range of motion, allowing you to work your deepest ab muscles without taxing your back.