well it depends what you are after... if its money then physiotherapy... there is a lot of money in physiotherapy whereas nursing there isn't a great deal of money, but if you want job satisfaction then they are both on a par, but if its to do with learnign about the stuff related to the subject then nursing is probably harder and you will be mroe respected for it.... although to be a physiotherapist i don't think you have to be fit, but you will have to know the working of muscles and how the body functions with stretching and how joints move, and my cousin who is 20 stone is a physiotherapist, both are good well respected jobs, but their is a great demand for both physiotherapists and nurses so this may not have been any help but it may give you an insight into the professions.