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fast and slow twitch are genetically determined. So basically, if you don't have specific muscles, you can't be athletes.
there are two different kinds of muscle fibers , slow twitch fibers(do not tire easily and fast twitch fibers(tire quickly,contracts much faster)
What are some different muscle fibre types?
Muscle fibre types:- There are two types of muscle fibres. Each has unique characteristics: Fast twitch (white) fibres These fibres are associated with explosive activities requiring speed and power. They produce a great deal of force; however, they fatigue more rapidly than slow twitch. View the video on sprinting, which depends on fast-twitch fibres. Slow twitch (red) fibres These fibres are smaller than their FT counterparts and are best suited to aerobic activities. They are associated with oxygen, hence the term "red" fibres. All muscles have a percentage of both types of fibres. This is genetically determined to a large extent. For example, distance runners typically may have: 79% ST fibres 21% FT fibres 100 metre sprinters may have: 75% FT fibres 25% ST fibres
What are the types of muscles fibers?