I love tennis, but I'm only a recreational player. I watch quite a bit of Tennis Channel and can't help but notice the incredible fitness of these pro players. These guys are ripped. So is it the fact that they play so much tennis that is allowing them to reach this level of fitness or is it the fitness regiment and diet they have outside of playing tennis that is allowing them to reach this level of fitness? I'm curious to hear if others might know something first-hand from pro players.