At his physical peak or during his presidency? Washington was a professional solider during an era when things frequently got up close and messy. I'd take young George Washington over TR any day. Same goes for Zachary Taylor. My final four would probably be Washington, Jackson, Taylor and (so as not to give short shrift to the 20th century) Gerald Ford. He was a big man and an athlete. Depending on how the tournament is seeded, I can easily see him making it to the semis, even if he doesn't know how to use a knife.