Hi, I have had rheumatoid arthritis for 21 years, as well as fibromyalgia. For years doctors told me not to do high impact aerobics or running. As a result I would do yoga, walking, bike riding and swimming. But just recently I started adding light jogging to my walk, & I have to say I feel great! I was very nervous about starting this, of course, but after each walk / run, I feel so good although a bit sore, which is normal after any exercise, but it encourages me to continue. I think it has to do with the endorphins it is producing and thus forth reducing my pain in the process. Of course I listen to my body and don't over do it especially if I start to feel pain while running, I'll just continue the walking part. So far it has done me well and I have not had any major flare ups. I do not notice much of a difference between running and other light exercise and how my body reacts, so I do believe for me at least it is doing me some good. Everybody is different, so just listen to your body and if you suffer excruciating pain of course stop. But you have to start somewhere, just go light on yourself and don't over do it. Hopefully this will encourage you to push yourself a little harder and it will do you some good. Power on!