A lot of times in movies and TV shows the father is often playing catch or some other sport with his son. Did you have this kind of relationship with your dad? My dad never played sports with me. He didn't have time and when he did, he'd rather be doing something else. I don't resent him at all for it and I think I prefer it that way.
Throughout my whole childhood. He would take me to the baseball field and basketball courts when I was young, and we practiced baseball together for 7 years while I played. Now that I'm playing tennis, we frequently head over to the courts and have practice sessions. Sometimes during the winter we head to the football field and throw around a bit as well. As a result of all this, he is very fit.