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why you breathe hard after working outbecause you are using energy...and when you use energy it is harder to breathe...so when you are done your body is taking the advantage that it is getting from you stopping.

Alsoooo

When you exercise your body makes more CO2, and takes in more O2, so the more CO2 you need to get rid of, so the more you need to breathe.

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15y ago

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