When I was in medical school in the early 1980s, bedrest for a week or more was often recommended for severe back pain. This sometimes included hospital admission. Then, research demonstrated that prolonged bedrest was actually a bad idea. It was no better (and often worse) than taking it easy for a day or two followed by slowly increasing activity, including stretching and strengthening the back.....
Source: Robert H. Shmerling, MD, Faculty Editor, Harvard Health Publications