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Light, strappy bras have their place, but when you're getting ready to play sports, run, or do an intense plyometric HIIT circuit (like this one!), you need something a little more supportive. High-impact sports bras are engineered to hold your boobs in place through the most jarring of workouts. Basically, if you've ever experienced uncomfortable or even painful bouncing during exercise, it's time to move up to a high-impact bra. The best ones (like the 11 we've rounded up here) are so comfortable, you'll forget they're on — which leaves you free to give that workout everything you've got.