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?

slow-twitch muscle fibers, which move more slowly but help to keep you moving longer fast-twitch muscle fibers, which help you move faster, but for shorter periods “Twitch” refers to the contraction, ...

Medically reviewed by Mallory Christopherson DC, FMT, CSCS Body types influence metabolism, weight gain and loss abilities, and health risks.The three main body types are endomorph, mesomorph, and ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

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From the August, 1985 issue of High Times comes Kyle Roderick’s remarkably forward-thinking profile of competitive women bodybuilders. Who are women bodybuilders and why are they popping up in the ...

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