I have some chronic health conditions that make it near impossible to work out even at a very low intensity, without my body revolting and crashing, leaving me unable to function for several days afterward. I have chronic pain, Postural Orthostatic Tachycardia Syndrome, Arnold Chiari Malformation Type 1, arthritis in my back and I've gained 80 pounds over the last 9 years, 40 of that in the last 2.