I read that people who are told "X builds substantial muscle mass" will experience more muscle growth than people who are doing the same thing but aren't told how "effective" it is in that regard. Kinda like a placebo. Exhibit B: "Two years ago, while presenting his technique to the Association of Canadian College and University Ombudspersons in Halifax, Miller cited a study in which children with leukemia who visualized a red army fighting a white army had their red blood cell count go up in 99 per cent of cases."

Bearing that in mind, do you think working out in dreams can have a similar effect?