Physical Activity

<\/div><\/div>”],”filter”:{“nextExceptions”:”img, blockquote, div”,”nextContainsExceptions”:”img, blockquote, a.btn, a.o-button”},”renderIntial”:true,”wordCount”:350}”> 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…