I have been trying to exercise for a long time. I had post exertion malaise where I would be completely exhausted and fatigued after a small amount of physical activity. This always confused me though... there have been times where I've been able to walk 20,000 steps for several days at a sporting event as a spectator. Yet there have been other times when 10 minutes of yoga has pushed me over the edge and caused me to crash, resulting in several hours or days in bed. Yesterday I did 39 minutes of physical activity, which included housework. I felt absolutely fine. In the past that would have exhausted me. Today I'm aiming to do some yoga and see how I go.