Mild exercise, including laundry, getting dressed, curling my hair, walking, gardening, cart golf, getting off of airplanes and out of cars after more than an hour's drive, household jobs, mild physical therapy, etc - most things I can do for a small amount of time but then, experience PEM - post exertional malaise. PEM = shortness of breath, weak/tingling legs, blurriness, unsteady, fatigue, etc. Doing exercises on the floor/prone doesn't seem to bring on symptoms.