Can you change slow twitch muscle fibers to fast twitch muscle fibers?
it has been shown that fast twitch fibres (type IIb) can behave more like fast twitch type IIa but there is no proof that slow twitch type I fibres can’t be changed to fast twitch type IIa or IIb. BUT just because you have a majority of slow twitch fibres does not mean that you won’t be good at sport, you just have better genetics for endurance sports rather than explosive speed sports or strength sports.