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 ...

Your DNA might be giving you an edge or could be holding you back. The ACTN3 gene encodes the protein alpha-actinin-3, which is found almost exclusively in fast-twitch muscle fibers. These fibers are ...

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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 ...

A few years back, Golf Digest Best Young Teacher Steve Buzza (above) authored a terrific article on techniques that boost swing speed. His message is to give it all you got when you swing the driver.

The smoking gun, for me, is the hill sprint at the end of the workout. I can still keep up with some of my younger training partners in tempo runs and mile reps, but when it comes to blasting uphill, ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? Picture this: You’re training for a race and have been determined to knock a ...

Every swimmer loves a good power workout. What is better than a practice full of short reps, lots of rest and a whole lot of speed? Power practices are designed for swimmers to not only train fast, ...

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 ...