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 ...

Good news: starting your running journey doesn't have to require diving in head-first and sprinting for 30 minutes straight. If you’ve never been much of a runner (or you’re starting to get back into ...

When it comes to quick, effective workouts, you can't beat HIIT (high-intensity interval training). Structured around timed intervals, you burn more calories in a shorter time in HIIT, since you push ...

A couple of years ago, I wrote an article about the fine-grained nuances of interval training. According to Paul Laursen and Martin Buchheit’s telephone book of a text, Science and Application of High ...

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, ...

With the launch of iOS 26, Apple has added a bunch of new features to the Fitness app—features that it has been sorely missing. Finally, you can track a workout from your phone without an Apple Watch, ...