Add Yahoo as a preferred source to see more of our stories on Google. That heart-pumping, give-it-your-all feeling is one of the reasons many of us run in the first place. And a ramped-up heart rate ...

Sally Kipyego, marathoner and Olympic silver medalist in the 10,000 meters, can hold a sub-5:00 minute pace in the 10K. Achieving that requires Kipyego to log plenty of hard track sessions and tempo ...

The quest to run without getting tired is a common challenge among runners of all levels. Whether we simply want to go farther without feeling out of shape or we want to try our hand at a new race ...

That heart-pumping, give-it-your-all feeling is one of the reasons many of us run in the first place. And a ramped-up heart rate during any type of exercise is not only normal, it's necessary. But ...