Experts share the best types of interval training to help you improve both as a long-distance runner and an all-around athlete.

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

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.

Lungs burning, legs ceasing up – no one actually enjoys interval training. Pushing through the pain is the only way to unlock faster PBs and achieve a higher level of fitness ...

A new study suggests that HIIT workouts may help preserve lean mass in older adults compared to moderate exercise—but changes were small. Here's what to know.

A typical Tabata workout consists of 8 rounds of 20 seconds of maximum effort exercise followed by 10 seconds of rest. This totals 4 minutes per exercise.

Not all intervals are created equal, even if the average wattage is kept similar. Making intervals that vary in intensity can make them really different from constant wattage intervals. Tough short ...

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 ...

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 ...