Modern tennis is the most natural, most coordinated and actually one of the easiest sports to learn.
Tennis may look superhuman at the high end, but it is not.
At the top level you just need a lot of practice to be in great condition and also to train the body to act in any emergency in the most efficient and powerful way.
Watch Federer hands and body, one of the best examples of all:
You can do it too at a smaller speed.
The best tennis instruction book ever, free: