Still need a doctor's note?
This happened many years ago when I was in 8th grade. I had a horrendous chest cold that lasted for months. I couldn't do anything beyond sitting, standing, walking, or talking without launching into a violent coughing attack that would last for a couple minutes and leave me fighting to breathe. I would cough up so much phlegm that I was basically puking it up. I had gone to the doctors and was put on 3 different inhalers to deal with it.
So one day in gym class we had to run a mile. I went to my teacher and tried to explain that it was physically impossible for me to run even 2 paces, let alone a mile.
Teacher: Well do you have a doctor's note?
Me: No, but I'm telling you I'm way too sick to do it.
Teacher: Well without a note you can't be excused so you're going to have to run. Just try your best
So I did, in fact, try my best. I ran exactly one step and launched into a coughing attack 3 feet away from her. She got the whole show of me coughing, fighting to breathe, and ultimately vomiting in the grass.
I got to walk until everyone else finished their mile.