Im 15 and I do body weight excercises and weight lifting as im trying to strentghen myself to help with my MA and overall wellbeing. I am joining a crosscountry club where you basically run long distance every day after school. I was reading some things about fast and slow twitch muscles and sprinting and crosscountry were examples, respectively. I was wondering, is it true that long distance running is pretty much only slow twitch muscles?and my main concern was this : does developing strong slow twitch muscles weaken or deplete your fast twitcht muscles? Most endurance runners seem to have small muscles which im guessing are slow twitch, and not very much bulk like sprinters.
PS i also noticed that although kick/boxers do lots of running and they are still muscular. Is this because they train harder to prevent muscle loss?
PS i also noticed that although kick/boxers do lots of running and they are still muscular. Is this because they train harder to prevent muscle loss?

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