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Your muscles require more energy when they are active during exercise. Muscles in your body metabolise glucose (sugar) in your bloodstream, breaking it down and taking it in to generate a high energy molecule known as ATP, which is essential for a cells functioning. Part of this process requires oxygen to fully break down the glucose-so when you need more energy metabolised, you'll need more oxygen too. If you don't get enough oxygen, your muscles will not be able to fully break down available glucose, they'll become fatigued and produce lactic acid instead- giving you a sore welling.

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13y ago

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