tennis is great for fitness and requires pretty good coordination. develops a strong back/shoulders too, which most people lack since these days everybody goes to the gym to get those tough looking muscles (chest/arms). if you think about it, the pulling muscles (back, lats, traps primarily) are much more valuable than the pushing muscles (chest, arms) since you don't often run into a situation in every day life where you need to push heavy shit around. however on the flip side, most tools used to facilitate the movement of heavy objects requires the user to pull the device around (dolly, wheelbarrow) and support the weight.
anyways.....
another great raquet sport is squash. insane work out - you're running suicides the whole friggin time - and i always have a lot of fun playing it. make sure you stretch out them legs before hand though, because i think the most soreness i've ever had the day after an intense physical workout was after a game of squash. i couldnt walk at all. the outsides of my thighs were on fire.