When approved by a healthcare professional to do so, physical therapy exercises are critical to maintaining muscle mass, improving stamina, & to recovering sense of balance. GBS often so compromises one's strength that the patient must relearn to walk. Often upon inpatient discharge, one is able to walk only with assistance of a walker, & with time & practice, graduates from the walker to using a cane, eventually improving to no longer need the cane. It's important to not exercise to exhaustion, but rather to exercise in brief episodes interspersed with rest periods. Forget the traditional concept of No-Pain-No-Gain. That is specifically discouraged with the GBS diagnosis. Early & frequent onset of fatigue is a very real consequence of GBS.