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People tend to relax as they get older, and most people sit more. Each extra hour of sitting increases the odds that they won't be able to get out of bed or do other daily activities.
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Older people who are active every day appear to lower their risk of heart disease and death by almost a third, even if they're not doing the kind of exercise that breaks a sweat. Gardening and puttering around the house qualify. And don't overlook berry-picking, a popular pastime in Sweden, where the study was done.