7 proven tips to avoid running injuries

Some studies show that as high as 79 percent of regular runners struggle with an injury sometime in a year. And contrary to popular believe, no single factor can be blamed for this high rate of injury.

RPE: An alternative to heart rate.

We use distance to determine how much you should run, and days per week to tell us how frequent we should run. But what do you use to determine at what intensity your runs should be? How do you rate how hard a training run was?