If the sports center is near your house, you don't have to spend a lot of time to reach it. Also each time you see it, you will think it could be nice to go there and to do some sports.
There some reasons for my not doing sports. I come rather tired after school. And also my homework takes a lot of time. Another reason is that none of my friends does sports on a regular basis. And I don't feel like doing sports alone. Also I prefer swimming to all other sports and there is no pool near my house.