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1) I think Ben burned most calories because he spent more time in total.
2) I'm not surprised that running burns most calories because it challenges your legs AND arms.
3) I can't explain how running burns more calories...
4) I think the modeling assumptions are valid because my Uncle cycles every day, my dad runs every day and my great Auntie swims every day, and my dad burns the most calories. (I think that they go about the same distance, and do it for the same time)