They say exercise helps with your cholesterol levels. (But I had a friend Air Force buddy who ran an 8 minute mile with cadets every week and he began "throwing" strokes.. his triglycerides were sky high in spite of his cholesterol being normal. IMO exercise is greatly overrated. The main thing to do is BREATHE. The real result of aerobic exercise is getting fresh, and plenty of, O2 to your cells. AND YES, you can do that lying in bed. heheheh