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Fitness Science: What Are Fast And Slow Muscles? It's Important For Your Athletic Performance

Do you guys feel like there could be someone who could complete a high-intensity interval training circuit, but could barely run a few kilometres? Or, what if a marathon runner couldn't even jump a box? It's a bit of an exaggeration to say that, but if that's the case then the difference could be in the composition of their skeletal muscles. Your body has two types of skeletal muscle fibres: Slow contracting (type i) and fast contracting (type ii).

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