I originally chose tennis because basketball became too demanding of a sport physically. I just didn't have the strength or stamina to play basketball competitively when I was younger.
I chose tennis because I didn't need to be a super-built athlete. At first, it was a way to stay in shape, but after realizing tennis was much more about talent/skill than fitness, that's when I started to step up my game to become a better player (and not so much a better athlete).
I am an unpredictable player. Even I surprise myself with some of the shots I make.