Fast-twitch muscles are responsible for high-intensity work like heavy lifting and sprinting. Here's how to build them and keep them healthy.

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A frequent source of lower-back pain comes from two muscles you might not have heard of—and that makes sense since you rarely see them on those medical posters of human anatomy in doctor's ...

Red Sox pitcher Tanner Houck sharp in rehab start with Portland Sea Dogs Houck throws five scoreless innings, Boston teammate Masataka Yoshida gets a hit and scores a run, and Portland wins, 7-1.

Muscle is a soft tissue composed of elongated cells (muscle fibres) that produce force and motion through contraction. Involuntary cardiac and smooth muscles are responsible for contraction of the ...