People are have AIDS or are HIV positive boost their T cell levels as a result of exercise. Even people who have had heart attacks and are told in no uncertain terms that exercise will keep them alive longer, still have a hard time sticking to an exercise program. More than half simply refuse to exercise. If exercise can bring us back to wellness after a major health problem, think of what it can do for you to keep you healthy in the first place. Obviously, it's not a one hundred percent guarantee.
Few things are in life.
Certainly the odds are in your favor for a vital, healthy, and happy life if you put some exercise effort into keeping your muscles toned. For stress prevention, there are few activities that better relieve the pressures of daily life than exercise. Everyone I know tells me that brisk exercise in the early evening after a day's work changes the remembered experience of the day. Most of the problems of the day simply vanish. People report they sleep better, are less cranky and suffer less anxiety.