It’s actually their biology
“Children not only have fatigue-resistant muscles, but recover very quickly from high-intensity exercise — even faster than well-trained adult endurance athletes. This is the finding of new research published in open-access journal Frontiers in Physiology, which compared the energy output and post-exercise recovery rates of young boys, untrained adults and endurance athletes. ”
https://www.sciencedaily.com/releases/2018/04/180424083907.htm
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