Children’s muscles recover rapidly from high intensity exercise. Their muscles process oxygen much more efficiently than the average adult’s. In fact, their muscles behave more like those of a trained adult athlete than those of an adult non athlete.
Here’s a source written for laypeople:
https://theconversation.com/yes-your-kids-can-run-all-day-theyve-got-muscles-like-endurance-athletes-95428
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