Ok, so maybe the president excercises a lot, much more than most Americans. But Jonathan Chait is a little too concerned–and seems to severely undervalue the benefits of the presidential philosophy on these matters. He writes:

My guess is that Bush associates exercise with discipline, and associates a lack of discipline with his younger, boozehound days. “The president,” said Fleischer, “finds [exercise] very healthy in terms of … keeping in shape. But it’s also good for the mind.” The notion of a connection between physical and mental potency is, of course, silly. (Consider all the perfectly toned airheads in Hollywood — or, perhaps, the president himself.) But Bush’s apparent belief in it explains why he would demand well-conditioned economic advisors and Supreme Court justices.
Bush’s insistence that the entire populace follow his example, and that his staff join him on a Long March — er, Long Run — carries about it the faint whiff of a cult of personality. It also shows how out of touch he is. It’s nice for Bush that he can take an hour or two out of every day to run, bike or pump iron. Unfortunately, most of us have more demanding jobs than he does.