Although i get winded, about 2 flights of stairs is my limit without resting and catching my breath, i'm ok walking on flat surfaces. If i go hiking, particular on any uphill section, i can go about 100 ft and need a break, then rest, then go another 100ft. But that is with my regiment of prednisone and vyvgart. You may want to talk to your Neurologist and see if you can try other meds. Maybe stay on the ones you are on, but add another one, to see if things improve. I was on IVIG infusions for about 6 months when my Nuerologist suggested I try vyvgart, i was skeptical because ivig made things WAY better, i could speak again and eat full meals without choking, but i tried vyvgart and things got actually even better. We are still trying new drugs, but it seems my current regiment is what i'll be on for a while until something new comes out. I have been reading about new meds that can reset your immune system, which is currently in trials. It will be interesting to see how those trials turn out.