If you didn’t already know you have different types of muscle fibers in your body, now you do. And depending on how you exercise or what sports you enjoy, you’re building and recruiting some ...

Arnold Schwarzenegger does a 360-rep finisher and calisthenics warriors go until they drop—but how many reps are actually ...

While running economy might not be a metric on your smartwatch, you can still take steps to improve it and run better.