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 ...

Most fitness-minded people have probably heard of fast- and slow-twitch muscle fibers. However, the distinction can be somewhat mysterious, especially in the context of understanding how it relates to ...

Everyone is familiar, at least hand-wavingly, with the distinction between slow-twitch and fast-twitch muscle-fiber types. The former are great for running marathons; the latter are ideal for ...

Here’s why some muscle groups respond faster (or slower) to strength training—and what you can do about it.

Many fitness elements such as strength, power, speed and agility are frequently paired together in training systems because they complement each other. You can see this in how football players train ...

There are a bunch of different reasons that serious endurance athletes generally don’t have big pipes. The most obvious one is that they spend a lot of time running and pedaling and so on, and very ...

Hypertrophy, the scientific term for the enlargement of muscle fibers, may not hold the top spot on the list of training priorities for some runners. Many of us (sometimes begrudgingly) cross-train to ...