When you’re ready to run faster for longer than a mile, you’re ready to try a tempo run. Tempo efforts are “comfortably hard.

How to Run Faster was created with Runner’s World Training Plans in mind. They are designed for runners of all levels ...

This is a problem you need to take a quarter mile at a time.

To enable it, open up your Settings > scroll down to About phone > tap on Software information > and then tap your Build number seven times. If this is your first time doing so, your phone should ...