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 ...

Fitness experts share which muscles running works and answer the age-old question: Does running count as leg day?

Another thing that can influence how well you put on muscle are your fast-twitch and slow-twitch muscle fibers. Skeletal muscles are composed of both of these fibers, which serve different ...

Former NFL pro Roman Fortin is helping his clients strengthen their "Fast Twitch" muscles—the muscle fibers we use when doing short, intense—more exertive activity. Problem is these types of ...

There are two types of skeletal muscular fibers in the body: slow-twitch muscle fibers and fast-twitch muscle fibers. Slow-twitch fibers are those that support longer, continuous exercises like ...