Most fitness enthusiasts have heard of high-intensity interval training (HIIT). But how often are you doing HIIT workouts on ...

Independently proven by the American Council of Exercise (ACE), CAR.O.L.—short for "CARdiovascular Optimization Logic"—puts fitness lovers through a type of HIIT called "reduced-exertion ...

Les Mills Sprint applies HIIT principles to spinning for days when you're riding solo. Try this simple 15-minute workout you can do at the gym. High Intensity Interval Training (HIIT) has been ...

Team USA gold medalist hockey star Hilary Knight is preparing for the Beijing Winter Olympics. One way Knight is training is with short bursts of a high-intensity exercise on an air bike. The routine ...