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I found this after a bit of research
Should myasthenia gravis patients undertake an exercise program? Different sources provide different answers. The very general answer is — exercise is helpful for people with MG, but patients should not embark on exercise programs that require maximum output and produce weakness. Exercise should be done in a way that stops short of muscle fatigue, and this point will vary from person to person depending on age, overall fitness level, MG symptoms and other factors.