The normal phrases I use are GET and CBT based on GET. "Graded Exercise Therapy" should mean that one can't decrease the amount of activity. Otherwise it is simply an "exercise programme" or a "paced exercise" programme. If a practitioner encourages a patient to go up and down (i.e. decide how much activity if any they will do on any particular day depending on how they feel), I don't think that should be called a Graded Exercise Therapy programme. Any exercise programme should of course be "graded". But Graded Exercise Therapy refers to specific programmes where one is not supposed to decrease based on how one feels (they sometimes now say if you have a virus you can decrease but I think that sometimes with this illness one can have flu-like symptoms but it is not necessarily a new virus).