A retrospective study analyzing physical activities of 10,269 Harvard alumni over 12 years showed that men who engaged in vigorous sports had a 23 percent lower risk of death than those who did not. Vigorous sports were defined as brisk walking, cycling, swimming, and yard work for 30 minutes a day on most days.
The Health Professionals' Follow-up Study evaluated the relationship between intensity of exercise and cardiovascular benefit in 44,452 men. The study found several types of sports that would result in a significant reduction in risk of coronary heart disease. The studied sport activities were:
- Running for one hour or more per week
- Brisk walking for 30 minutes or more per day
- Lifting weight for 30 minutes or more per week
- Rowing for one hour or more per week
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