I remember the day it started. I had been sick, but I'd gotten better, and it was one of those summer days where
I was more careful after that.
It happened again in the freshman year of high school. The gym teacher had us running sprints, and we'd done something or other wrong, and we just kept running and running...
I got dizzy and my lungs did that nasty thing again. Goodbye, health for winter break!
I'm plenty strong. If I do things that don't strain my lungs, I have decent endurance. I just can't do anything that makes for heavy breathing when I'm sick, because that makes it worse.