When it comes to lifting weights, everyone has an opinion. One day you hear heaving heavy weights will leave you looking like a linebacker (it won't). The next day, rumor has it that supermodel limbs are a mere 10 minutes away thanks to the Miracle Machine du jour (not in this lifetime). The fact is, those little hand weights aren't the only dumbbells lurking around your gym. If all this conflicting information is enough to make you burn your jog bra and bag working out altogether, fear not: We sought out two of the most in-the-know pros in the fitness industry to clear up your confusion once and for all. 1. If you lift weights, you'll bulk up. "It's physiologically impossible," says Michael Wood, director of the Sports Performance Group in Cambridge, Mass., and an exercise physiologist at Tufts Research Center on Aging. The reason? Testosterone is responsible for a muscle's bulk, and women simply don't have enough of this predominantly
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