1. Lack of exercise is a major cause of chronic diseases;FW Booth,2012
2. Changes in physical fitness and all-cause mortality. Prospective Study of Healthy and Unhealthy Men;SN Blair,1995
3. Physical activity in the United States measured by accelerometer;RP Troiano,2008
4. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: Guidance for prescribing exercise;CE Garber,2011
5. Actual Causes of Death in the United States;JM McGinnis,2004