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 A 20-year study testing the fitness of more than 4,300 participants over 50 found that a modicum of physical activity — as short as a half-hour walk per week — can reduce one’s risk of mortality from cardiovascular disease by half. In devising the study, researchers from Stanford University divided participants into groups based on their average level of activity. The second-least-fit group exercised more than the least-fit group, but only slightly — by the equivalent of 30 minutes of walking per week. Yet the difference in health proved astounding. The least-fit group was twice as likely to die of cardiovascular disease than the second-least-fit group. The study, appearing in Medicine & Science in Sports & Exercise, controlled for unrelated factors like cancer.
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