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Epidemiological studies have demonstrated the considerable benefits of habitual vigorous activity, both at work and during leisure time. There are many benefits at all ages and for all levels of fitness, but particular emphasis is being placed on the cardiovascular benefits. Exercise may induce beneficial changes in lipid profile and thus reduce risk of cardiovascular disease. Lifestyle changes cost little, have few side-effects, and are self-administered. Increasing habitual physical activity is a form of lifestyle modification that can be tailored to all needs--a non-therapeutic intervention of proven efficacy and of value to all patients.
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Domhnall MacAuley (1993) studied this question.
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