![]() ![]() In the past decade, every branch of the U.S. findings showed that sit-ups and crunches weren’t just mediocre strength-building moves they were actually hurting lots of people. ^ a b The Death of the Sit-Up - The Atlantic:.^ "Core Anatomy: Muscles of the Core".This is said to eliminate any involvement by the hip flexors, and make the crunch an effective isolation exercise for the abdominals. In a crunch, unlike a sit-up, the lower back stays on the floor. Research has shown that both sit-ups and crunches are mediocre strength-building exercises and have hurt many people. Gently lift your head and shoulders, hold briefly and relax back down. "Do not hollow your stomach or press your back against the floor", McGill says. The biomechanics professor Stuart McGill was quoted in The New York Times Health blog as stating:Īn approved crunch begins with you lying down, one knee bent, and hands positioned beneath your lower back for support. Form In a crunch, the lower back does not lift off the floor Crunches are less effective than other exercises such as planks and carry risk of back injury. Crunches use the exerciser's own body weight to tone muscle and are recommended by some experts, despite negative research results, as a low-cost exercise that can be performed at home. It enables both building "six-pack" abs and tightening the belly. ![]() The crunch is an abdominal exercise that works the rectus abdominis muscle. ![]()
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