I was wondering if people can think back to their pre illness levels of energy. Do you think you could have regularly worked 12 hour shifts? I know there's been discussion on sport pre illness but what about daily life stamina? Watching NHS program on BBC in the uk and the junior doctors who have to work in a busy hospital 12 hour shifts as routine for years, I don't think I could possibly have seen that as anything other than massive struggle or even feasible PRE illness when I was young. So are junior doctors super human, are some of us just weaker and is there correlation to this and ME/CFS?