Hi everyone, last weeks I've been doing quite good. I started to go to the swimming pool 3 days per week and one day gym. Last year every time I tried to go to the swimming pool I would have PEM for a couple of days, however since two months ago this trend changed and I was feeling great after a session in the pool. I felt like more energy, I was going during the morning to take advantage of this energy for the rest of the day. I was so happy. Plus, I was going one day to the gym, doing little weights and some repetitions ( around 20). This rutine was working, I was seeing some progress (although I can't manage to gain weight) specially at the pool. However, last monday I think I overdid at the gym trying to make bigger weights and I got PEM for a few days since then. I've heard aerobic exercise is not good for CFS. But nowadays it seems that it is working the other way around for me. I am very skinny (185cm 71kilos) and the doctors advice me to try to gain weight, however I give up on this now as I see it impossible. Should I stop swimming if I feel is being good? Has anyone have had a bad experience with aerobic exercise? I think I can handle swimming since I added glutamine as a suplemment.