"When I came across these Nike Flex TR8 sneakers ($70), I truly thought they were too good to be true. I've been on the hunt for stylish cross-trainers, and this pair totally fit the bill. They're designed for high-intensity, cardio-heavy workouts both inside and outside the gym, which make them perfect to wear at classes like Barry's Bootcamp. On top of that, they're super lightweight and breathable. I'm obsessed to say the least." — Nicole Yi, assistant editor, Fitness