Even in a low-impact sport like cycling, you still need a quality sports bra. Not only will it keep you supported, but the materials are better suited for a sweaty ride. The Lululemon Energy Bra ($52) offers light support and won't chafe the skin in sweaty environments like an indoor cycling class. "This bra is by far the most sweat-resistant bra," says Allie. "Which is key when burning 500-700 calories in a 45-minute class."