About active sports, talk to your doctor about a hernia. I healed very quickly and could do most things within three weeks from my operation, but I was told I was much of an exception. What I was not told was about hernias. I'm not sure it would have made any difference, but I did get a hernia within a year of my operation. It is not painful, but it is a rather large bulge. It sticks out like half a large grapefruit with my stoma right in the center of it.
So what to do? I'm not sure anything can be done to prevent an ostomy hernia from developing. A high percentage of people develop them. Having said that, I still do whatever I want with the exception of violent sideshow rides or football, etc. You could unintentionally start a hernia playing any fast-acting sport, in my opinion. I, for one, would not play racketball. However, your choice, I have played it long before I had my operation. I just think that it is a risk that is not worth taking. You could and should wear a 4" hernia belt quite tight with a dome guard while you play to be as safe as you can be. However, the damage which will start a hernia is done inside your stomach wall, not on the outside. Remember you are not 40 or 50 anymore...you did it, you don't have to keep doing it. Do some research about parastomal hernias and form an opinion if you want to do any fast or rough sports still, I do not.
Just saying!