Nike Free Bionic Women’s Training Shoes, $95,

I'm a pretty devoted outdoor runner, but it's always good to change up your routine—especially when in the middle of a heat wave! High Intensity Training (or interval training) is super challenging, but also incredibly efficient (read: less time spent working out) and these new shoes are specially designed to get you through all those burpees, planks, and squats. Plus, they look great post-workout.

Photo: courtesy of Nike