> black people tend to have more dense fast twitch muscle, while white people tend to have less dense slow twitch muscle I think you may be confusing fast twit

> black people tend to have more dense fast twitch muscle, while white people tend to have less dense slow twitch muscle I think you may be confusing fast twitch muscle density, as in the ratio of fast twitch to slow twitch muscles, with density as a physical property. As far as I know fast twitch muscles aren't any more dense than slow twitch muscles.