Have you heard of fast-twitch and slow-twitch muscle fibers? These are the two types of muscle that are responsible for all your gains in the gym. And depending on how you train — and even your own ...

When you picture different athletes—marathon runners, gymnasts, and Olympic weightlifters, for example—you likely categorize them instinctively by their height, size, and build. But the differences in ...

As we age, we lose muscle at the rate of 5 to 7 pounds per decade, unless we perform regular strength training. However, even when we do progressive resistance exercise we experience a change in our ...

If your fitness goal is to up the ante on endurance, pack more power into your sprint, or supercharge your strength gains in the gym, it’s worth exploring – what are the different muscle fiber types?