We all need exercise. This is true for young people (in their teens) as well as for adults. Even if you don't plan make sports your main occupation. This is my opinion and I feel like it is true.
As long as I can remember myself I was always keen on tennis. I love this sport with its old noble traditions, though myself never dreamed of becoming anything more than an amateur.
I watch closely all tennis competitions and championships. There are a lot of them, but my favourite championship is Wimbledon because old tennis traditions remains there as they are.
Some of the most well-known Wimbledon champions are: John McEnroe, Boris Becker, Steffi Graf, Monica Seles. My dream is to get a chance to watch at least one of them playing.
And meantime I play tennis with my friends. It is also a great opportunity to socialize with people who have similar interest (as any sport I suppose).