The 10 fittest presidents:1. Thomas Jefferson (1801-1809): This dude was buff -- tall, sinewy, virile. He was an avid walker and horseman on his Monticello estate. He walked until his 83rd birthday.2. Teddy Roosevelt (1901-1909): He wrestled, boxed, fenced, rock-climbed, engaged in jujitsu, played tennis, rode horseback and hiked. Still, he died at age 60.