[matt711]

I can see lacrosse and hockey. I guess my main contention is that any sport that requires an implement (bat, raquete, hockey stick) requires more skill than one without. The more implements the more skill required. More moving parts...

I would classify golf as a game. Not much cardio, lots of concentration though. Tennis requires the same level of concentration but for a more constant and prolonged period of time in addition to a high degree of cardio.

The hand-eye coordination that tennis requires is very high. Not only are you trying to hit a ball hard but also in a controlled manner. The ball has to land inside the line and it is never sitting still when you hit it. The ball is usually hit with a lot of spin as well which affects not only the flight of the ball but how it reacts when landing in the court.

I am not trying to bad mouth anyones favorite sport. Many of the ones listed above I have never played.