Interval training has become very popular these days, thanks to high-intensity interval training, or HIIT. Proponents of this type of exercise say it delivers many of the benefits of a much longer ...

Pushing yourself too hard could actually be stalling your progress.

"I just started doing interval workouts and I love them. I’m running hard then jogging for one minute each, but I’m finding I’m not recovered after the breaks. Can I modify the recovery without losing ...

Every once in a while, I get a reminder that Twitter really can be useful. In this case, it was a tweet from Andy Jones pointing out an interesting detail in a new study that I might otherwise have ...

Researchers from the University of Southern Denmark investigated how eight weeks of high-intensity interval training affect the structure of mitochondria—the parts of muscle cells that produce energy.

Eight weeks of HIIT increases both the number and efficiency of muscle mitochondria by expanding their energy-producing inner membranes.