What about for 'mild' CFS though. Not bed bound by a long shot, but strong enough to dampen life - for me going to work is the main thing and I try to do little else. But I can do 40 hours a week plus help out a bit a home and that is quite maintainable IMO, but if I did 40 hours a week plus look after kids plus some exercise I think I would be fucked. Last time I started going to the gym again - boom - the flu symptoms come back after 3 sessions. Not really going hard.