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Exercise may be the closest thing to a fountain of youth. Not only does regular activity strengthen your muscles and improve heart and lung function, but it can also slash your risk of major diseases, stimulate the growth of new brain cells, and even add years to your life, studies show. Just 30 minutes of physical activity on most days is all that's required to reap big benefits.
The range of health bonuses now attributed to exercise has surprised even doctors. Research suggests that workouts may do the following:
1) Keep you young. Workouts such as brisk walking or cycling boost the amount of oxygen consumed during exercise. Improving your aerobic capacity by just 15 to 25 percent would be like shaving 10 to 20 years off your age. Aerobic exercise may also stimulate the growth of new brain cells in older adults.
2) Reduce infections. Moderate workouts temporarily rev the immune system by increasing the aggressiveness or capacity of immune cells. That may explain why people who exercise catch fewer colds.
3) Prevent heart attacks. Not only does exercise raise "good" HDL cholesterol and lower blood pressure, but new research shows it reduces arterial inflammation, another risk factor for heart attacks and strokes.
4)Ease asthma. ...