Runkeeper was placed on Earth by supreme beings of some sort. Its programmable, GPS-tracked interval runs make the iPhone into a serious, and entirely thoughtless, training tool. But Runkeeper’s ...

High-intensity interval training (or HIIT) has taken the fitness world by storm. HIIT workouts involve intense bursts of exercise, which allow you to exercise for a shorter amount of time, while still ...

When 3 p.m. rolls around, my energy levels are usually at a low — the midday slump is in full effect, and another cup of coffee would only deliver a case of caffeine jitters. What is helpful though, ...

The American Heart Association recommends that adults get "at least 150 minutes per week of moderate-intensity aerobic activity or 75 minutes per week of vigorous aerobic activity" — or a combination ...

HIIT workouts, or high-intensity interval training, are an effective way to exercise at home. Instead of requiring equipment, HIIT workouts focus entirely on bodyweight exercises. This expert-designed ...

High-intensity interval training (HIIT) is a cardiorespiratory training technique that involves short bursts of intense exercise followed by even shorter rest periods. You repeat this cycle several ...

For those of you who don't know, I wrote an interval timer app for iOS. A feature request is to allow it to run in the background. Apparently people fidget with their Music or Podcast app enough while ...