Trump thinks that exercising too much uses up the body’s "finite" energy

Trump’s views on exercise were mentioned in a New Yorker article this month and in “Trump Revealed,” The Washington Post’s 2016 biography of the president, which noted that Trump mostly gave up athletics after college because he “believed the human body was like a battery, with a finite amount of energy, which exercise only depleted.”

Exercise does deplete stores of glucose, glycogen and fats from the body’s tissues, but these fuels are restored when a person eats, said Michael Jonesco, a sports medicine and orthopedics specialist at Ohio State University’s Wexner Medical Center.

Rather than thinking of energy stores as a battery, “a better analogy would be like the fire that you continue to fuel with more coal or wood,” Jonesco said. “You need to continue to add fuel, or your flame will die. This is true whether you exercise or not. . . . Simply by existing, we are burning energy.”

What’s more, although exercise puts a temporary stress on the body, the body adapts to that stress so that the heart and muscles become stronger and more efficient. “If we can create a battery that, every time it’s used, actually becomes more powerful and efficient, then sure, our body is like that battery,” Jonesco said.