Every so often, a new type of workout seemingly takes the fitness world by storm. The latest in this long line of buzzy fitness fads: the Norwegian 4x4 workout, a high-intensity interval training ...

High-intensity workouts are some of the best ways to improve health and athletic performance. With a short, intense interval workout, researchers have found that some people see benefits equal to or ...

There’s a lot of talk in the exercise world about high intensity interval training (HIIT) lately, which is exactly what it sounds like — alternating episodes of exercise with periods of less intensive ...