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?

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 ...

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 ...

Stimulating or damaging a nerve can cause muscle fibers to twitch. Muscle twitches often go unnoticed and usually aren’t a cause for concern. However, they can sometimes indicate health ...

The size and length of your tendons and the makeup of your muscle fibers affect your abs, too, and these are things you can’t change. “Some people have more fast-twitch muscle fibers ...

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 ...

Chimps possess about twice the amount of "fast-twitch" muscle fibre. This type of fibre contracts quickly and is useful for rapid movements such as sprinting. But fast-twitch fibres have a ...