In different organisms and people there are different amount of slow and fast twitch fibres, E.g long distance runners have more slow twitch and sprinters have more fast twitch, this is due to their properties:
Slow Twitch: more myoglobin(redder), more respiratory enzymes, lots of mitochondria, aerobic, lots of capillaries, less sarcoplasmic reticulum, fatigue resistant.
Fast twitch: Less Myoglobin, less capillaries, anarobic, less mitochondria, lots of sarcoplasmic reticulum, fatigues quickly.
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