It feels good to push the body to the point of exhaustion. Leaving the gym or a fitness class soaked with sweat is a deeply satisfying manifestation of the endorphins humming around in your brain.

There may, however, be a shortcut. High-intensity interval training ( HIIT) promises to get you fit with just a few minutes of work a week. It sounds too good to be true. But the evidence suggests it ...

Exercise strengthens the heart, improves circulation, regulates blood sugar and cholesterol, and helps maintain a healthy weight—all of which protect against chronic diseases and ultimately promote ...

The debate about how hard to push during exercise has persisted for decades, with fitness approaches swinging between high-intensity interval training and gentler, steady-state activities. However, ...