Begin with short intervals of running followed by short intervals of walking, then slowly progress to longer intervals of ...

Switching to an 80-20 split would actually mean doing less total mileage, because they would be replacing a big chunk of their medium or hard running with easy running.

What is 80/20 training? The latest research tells us that running slower for the bulk of your runs really can reap huge rewards, we look at how this works.

Running was a byproduct of this mindset — a tool to help lose the weight, along with proper nutrition and strength training. At first the running was just plain difficult, and not enjoyable.

Even those running less get faster in races when abiding by this golden ratio of training intensity.