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Physics

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    $\begingroup$ Good post, but you are confusing [mechanical] work done and energy spent. If you push the wall you do 0 work but burn a lot of calories. $\endgroup$ Commented Sep 3, 2014 at 5:39
  • $\begingroup$ True. I'm ignoring the fact that human muscles aren't 100% efficient. $\endgroup$ Commented Sep 4, 2014 at 14:40
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    $\begingroup$ Inefficiency of the muscle has nothing to do with energy burned and mechanical work produced $\endgroup$ Commented Sep 20, 2014 at 14:07
  • $\begingroup$ My impression was that the efficiency of a muscle performing some action is the ratio of mechanical work performed to actual energy burned. Isn't it? $\endgroup$ Commented Sep 20, 2014 at 20:28
  • $\begingroup$ No, it isn't, it is explained in my post $\endgroup$ Commented Sep 22, 2014 at 7:31