I had been overweight for most of my adolescence until I got heavily into mountain biking.

Withing 18 months I'd lost the weight and I owned everyone else in my year in some interval sprints we were doing. Unfortunately the exertion combined with whatever else was going on at the time caused me to leak/not shit out my arse a bit.

We wore white shorts for P.E. and despite this weirdness being mostly clear it left a definite stain.

At least I was fit enough to run ahead the 3/4 mile back to the changing rooms anf nobody ever called me out on it.

The pedo P.E. teacher was impressed with my performance however. I'm glad I got to launch a softball to his balls at full speed one time.