There can get a point where you’re climbing mountains, navigating rough terrain, or carving fresh pow and feeling good —but ...

What's the first thing that comes to mind when you think about the words twitch and muscle? Spasms, perhaps. You'd hardly be alone in thinking that. But when it comes to fitness, it's most commonly ...

Ever wonder why some people seem to pack on muscle effortlessly while others spend months in the gym with little to show for it? Muscle growth isn't just about lifting weights -- it's a complex ...

Tsukuba, Japan—Muscle fibers, which constitute skeletal muscle, are classified into two main types: slow-twitch (Type I, red muscle) and fast-twitch (Type II, white muscle). Slow-twitch fibers are ...

Runners have two main paths to choose from when it comes to running goals: run faster or run longer. Both will make you a stronger, fitter athlete—but training for one looks a little different than ...

Time under tension (TUT) is a weightlifting technique designed to build muscle mass by increasing the time muscles spend activated during an exercise. We cover if it works and what its benefits are.

Here, five workout mistakes that are holding you back from serious muscle growth—and some simple ways to get right back on ...