Interval running condenses the powerful effects of regular running into shorter, high-intensity bursts. Research shows it can ...

HIIT workout founded by a Japanese Olympic coach that uses periods of intense exercise and rest to burn calories.

The hallmark of HIIT is repeated bouts of extremely hard work interspersed with periods of recovery. During your work intervals, you’ll be pushing yourself nearly to your max, Noam Tamir, CSCS, ...

“Smaller-interval HIIT or Tabata-type workouts will be just as beneficial.” If you’re not persuaded by this argument (or just want to try the Norwegian 4x4 for the sake of joining in on the trend), ...

Want to add some extra challenge to your walk? Or want to tone down your too-tough run? “Jeffing” may be your answer. Jeffing is a training method that comprises both running and walking intervals ...