When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Countdown Interval Timer is a fitness app available for Windows 10 PC and Mobile that is designed ...

This iPhone app is so elegantly designed that, while you still won’t want to work out, you’ll really wish that you did. Runkeeper was placed on Earth by supreme beings of some sort. Its programmable, ...

We like interval training because you can pack a lot of effective exercise into a short amount of time. In fact, you can use it to do one of the most effective routines in only 20 minutes. Regardless ...

Interval training is pretty tough work, but it's the best way to keep in shape when you don't have a lot of time on your hands. That said, if you want to do it right, The New York Times suggests you ...