Emma Maria Mazzenga is an elite sprinter, and at 92, has few competitors. Photo: Claudia Gori/For The Washington Post Emma Maria Mazzenga likes to win. She once dislocated her shoulder during a race ...

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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, ...