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What you wear to cover your booty can make or break a run (chafing,anyone?). Luckily, your options are way more varied than old-school gym shorts. We had more than 50 testers in all shapes and sizes put more than 150 different running shorts through the ringer. Real runners took popular styles for a handful of test runs (and a wash or two) to find the most durable, comfortable and stylish bottoms out there.