Zing! These workouts from Woods will teach your bod to fire on all cylinders. On the effort scale of 1 to 10, 10 is your all out top speed and anything 8 or higher is considered a sprint. Do two speed ...

Let's start with a bold statement: There are runners who only want to live life in the fast lane. And then there is the other kind of runner, who prefers to maintain a slower, steadier pace—even if it ...