Is Willie Mays the greatest physical specimen in the history of the game?

Rickey Henderson was an aboslute rock and he played 30 years if you count the years he stuck around in the minors before he hung up his cleats. Same with Julio Franco...the man played until he was 49 years-old (rumored to be older) and was still solid stone when he finished. I would argue that they were the two greatest physical specimens to ever step on a baseball field.