At Runner’s World, we love geeking out on the incredible numbers behind great running performances. When 16-year-old Cooper Lutkenhaus recently broke almost every high school 800-meter record in the ...

No complicated terminology, no convoluted workouts, this simple, expertly-designed couch-to-5K training plan will turn you into a runner.

I am an avid runner, and have been for many years. It started on a whim. A friend asked me if I wanted to participate in Tough Mudder, an obstacle course-style race, just after I graduated from ...