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The human body converts the energy contained in food to mechanical output with an efficiency that may surprise you β€” it’s that low. What goes on at the gym reflects this. A person dedicated to keeping reasonably physically fit might use a rowing machine, an elliptical trainer, or a stationary bicycle. These machines usually provide readouts that show how much work the user is doing, and how many Calories she is burning. Checking the numbers now and then helps pass the time, and may provide a little reward at the end.Read the rest “The Inefficiency of Humans”