Whether you're a frequent or infrequent gym-goer, there's a good chance you've done crunches. Crunches are a classic core-strengthening exercise. But while they may seem ubiquitous - heck, they're even part of the dreaded Presidential Fitness Test - they aren't the only way to strengthen your abs. Like all exercises, crunches work best - and make you the least susceptible to injury - when they're...

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