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 ...

Runners usually talk about muscles in terms of quads, glutes, and hamstrings. Exercise physiologists, on the other hand, talk about muscles in terms of fast-twitch and slow-twitch--which is one reason ...

Skeletal muscle is the type of muscle that controls movement. Problems with these muscles can be minor, life-threatening, or ongoing problems that make it hard to perform basic daily activities.

View post: Should You Increase Sodium the Night Before a Race? Here’s What Experts Say Have you heard of fast-twitch and slow-twitch muscle fibers? These are the two types of muscle that are ...