This is all fun for Trump. It energizes him.
He has always had boundless energy.
BTW, you know he doesn't drink alcohol either.
You mean Trump does not fly tourist class on flights? How elitist! /S
It does not matter how comfortable his aircraft is, he does not have to do what he is doing. Life is far more comfortable in Trump Tower Penthouse.
He walked 45 minutes in the hot and humid Iowa summer weather. I spent 2 years in Iowa city. Summers are horrible. And so are winters!