I guess "exercising" is a relatively new thing in human history. Normally, calories are something you want to save, not something you want to lose. People worke

I guess "exercising" is a relatively new thing in human history. Normally, calories are something you want to save, not something you want to lose. People worked out by doing actual work, training or playing. If you think about it, the idea sounds completely ridiculous. Doing a minute of painful of physical activity with no practical use because you are too busy not moving. If you go back in time with this idea people will probably ask you what crime you committed to deserve such punishment. For it to make sense, you need an unnatural combination of abundant food, sedentary work and little free time, which only recently became a thing for commoners.