Asthmatic - positions you dislike ?

Greetings!

I've been training bjj for a couple of years now (as an asthmatic on controller medication, enabling me to train) and recently noticed some positions are worse for me than others - higher strain in general, lungs cramping faster, that sort of thing.
Soo i'm curious ... fellow asthmatics, older? grapplers, people with other medical issues that might relate:
do you have some positions or approaches you struggle with more ? How do you cope if it comes up during a roll ? Some things in general you dislike to do ?

Would love to read some of the things you are willing to share!