Not to worry. I'm very active also. Though I've had my ostomy for 17 years, I got mine when i was 28. You just need to take certain precautions. Put on a new appliance to guarantee the best seal, or simply empty the pouch before an activity. I was always big into physical sports, ie:softball, raquetteball, touch football. you name it. Just take it one step at a time to build your confidence. The only thing I don't do now is sleep on my stomach. That's it. Also you mentioned racing. I own 2 Corvettes. And although I don't race them, being 6'3" it's a tight squeeze to get in, and there's NEVER a problem. Your concerns are natural. you'll be fine.