Humans are about 25% efficient, so feel free to multiply any number with 4 to get actual expended energy.<p>That doesn&#x27;t change the calculus, obviously. I can easily sustain 150W for an hour on a bike, I can&#x27;t lift 225kg half a metre against gravity 500 times (the equivalent).<p>(The idea here is that you try to back up lofty claims with some science numbers.)