Tagged With High-Intensity Interval Training

Short, intense workouts that are becoming wildly popular may help build muscle better than traditional exercise


Shorter, high-intensity workouts offer the same benefits as longer, moderate ones — here's how to get started and how it could transform your body


The fitness guru behind the 'Insanity' workout told us the main reason you're not motivated to exercise -- and how to dive back in



The fitness guru behind the 'Insanity' workout told us the one move you should master now


I'm addicted to a boot camp-style workout that's taking over America -- here's what it's like