They don’t have more energy. They consume and expend fewer calories and get tired very quickly. A healthy adult has significantly more capacity for mental/physical exertion than a child.
Kids appear energetic to us because we see them exerting energy with poor efficiency or even pointlessly, but this is a normal part of childhood learning/development. I guess this can incorrectly give the impression that their energy reserves are so large, they can afford to waste them.
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