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Just 700 generations ago, every human being on the planet was a hunter-gatherer. Running, throwing, jumping, lifting—and the occasional tangle with a hungry saber-tooth cat—our ancestors were world-class athletes merely out of necessity. Fast-forward a few thousand years and many of us more closely resemble the giant sloths they hunted. If you're making an effort to exercise, congratulations! You're part of a proud, dwindling minority. But doing an exercise incorrectly can be worse than not doing it at all. With these five often-bungled movements, form is everything.