Just wanted to add my experience to this.

I have found that when I first start LC, the best thing for me is using weights as opposed to aerobic exercise. I hurt so bad from FM that I can't even think of walking until I get some weight off.

I just started again yesterday and will start using weights after about a week when my body is getting used to it. I do upper body one day, lower body the next. Start very slowly with light weights.

Hope this helps