February 11, 2026
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What happens to your body when you run a marathon?

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When you walk or run, your body uses only the slow-twitch muscle fibres to drive you forwards.
What happens to your body when you run a marathon?
When you walk or run, your body uses only the slow-twitch muscle fibres to drive you forwards. However, during a marathon, the body makes use of every single type of muscle fibre. This, in turn, uses up a lot of blood and almost all the carbohydrate energy supplies stored in the muscles and blood. T
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