Physical activity: an investment that pays multiple health dividends: comment on "combined effects of cardiorespiratory fitness, not smoking, and normal waist girth on morbidity and mortality in men," "physical activity and survival in male colorectal cancer survival," "effects of a television viewing reduction on energy intake and expenditure in overweight and obese adults," and "physical activity and rapid decline in kidney function among older adults"
Arch Intern Med. 2009 Dec 14;169(22):2124-7.
doi: 10.1001/archinternmed.2009.413.