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 ...

"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 ...

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.

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 ...

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