To put in effort of sports and not be good at any of them?

I understand there are lots of sports fans out there and that sports are something people are good at. Unfortunately for me, even though that I read on sports games and lay them, I am not good at any of them. I don't know if this is something I am not doing right or what but I have attempted to learn them, play them and not understand why I can't get better. This includes: basketball, football, tennis, baseball, soccer, volleyball. I just want people whom respond to understand that I do exercise which includes strength training, cardiovascular training, weight lifting and endurance training and am improving in all of these areas.