I have what our "family doctor" (this was in the 1970s) called "sports induced" asthma.....over-exertion during exercise....This was diagnosed when i was 15...He put me on pills but quickly decided against it.
He ended up telling me to just stop my activity whenever i felt my chest starting to tighten up.
Asthma didn't stop me from playing any outdoor activity.
I am now 48 and my current doctor prescribed an inhaler...just in case.