How do you balance exercise and MG?

How does one differentiate between exercise- induced weakness and shortness of breath and MG-induced muscle weakness and shortness of breath?
I'm not crazy overweight but I've not exercised for many years because of sciatica. I'm now all healed from back surgery but I need to take off excess weight from being sedentary.
Advice?

I have the myasthenia gravis for more than 10 years and I have noticed that all those days without exercising I feel much worse than days when I spend some time in gym or day after. Unfortunately I cannot visit my gym more than two times a week. But if I could I would visit it more often

This is interesting. I’ve had MG for about 7 years and recently went through 16 PT sessions for hip pain. The sessions were two a week for one hour. The results were very positive but I was really surprised at how sore I was and how long it lasted. I was still sore after four days. Btw, I am 74. It has just now occurred to me that my MG may be the reason. In any case, it was worth it for relieving my pain and improving my strength and general wellbeing. I am taking up walking to try to maintain my strength.

I am 71 and have only been dealing with MG for a little over a year. I have always been very active, gym 5 days a week and cardio at home on my off days. I have slowly had to dial it back and make changes in frequency in order to have some recovery time. I recently changed to an every other day gym routine and rather than hike up the steep trail I now take the flat one but the same distance, running is now out of the question. I will continue to adjust but hopefully be able to improve rather than regress, but it is what it is.