Using the analogy of a standard battery, Mr. Trump reportedly believes every human is born with a finite amount of energy according to Vox. Once a person has drained this finite energy, the person then dies. This is of course wrong (Snopes debunks this myth here )
After college, after Trump mostly gave up his personal athletic interests, he came to view time spent playing sports as time wasted. Trump believed the human body was like a battery, with a finite amount of energy, which exercise only depleted. So he didn’t work out. When he learned that John O’Donnell, one of his top casino executives, was training for an Ironman triathlon, he admonished him, “You are going to die young because of this.”
A more accurate analogy would be comparing the human body to a rechargeable battery. For instance, absent additional energy, a rechargeable battery will eventually snuff out, however, so long as the battery is being fed energy, it will continue to survive so long as its composite parts continue to work.
Some have suggested that Mr. Trump is the heaviest man to be President since President William Howard Taft who left office in 1913. President Taft began a fitness regimen following his appointment to the U.S. Supreme Court, however, eventually losing a significant amount of weight by the time of his passing.