Health monitoring allows you to discover and treat health problems early, before the consequences. Many psychological disorders, cancers, metabolic disorders, cardiovascular diseases, pulmonary diseases and musculoskeletal disorders can be prevented by monitoring health and integrating physical activity and exercise; for example: depression, breast cancer, obesity, cardiomyopathy, emphysema and osteoarthritis. Practicing exercise or physical activity has major benefits. One of the main benefits is the reduction in the risk of premature death: “it is estimated that people who were physically active for around 7 hours per week have a 30 to 40% lower risk of dying prematurely than those who are active for less than 30 minutes ". per week” (Kohl and Murray 2012). It is clear that research has shown the importance of avoiding inactivity and that even a little physical activity is better than none at all; due to the dose-response relationship between poor health and the amount of physical activity. “Epidemiology is the study of the distribution of the determinants of disease, disability and populations” (Mausner & Bahn 1974). This is fundamental public health science and measured scientific control that relies heavily on data and study design. Those who study epidemiology focus on a specific population and how disabilities and diseases affect them. Epidemiological methods have been applied to investigations of infectious disease outbreaks, but also to studies of longer-term chronic diseases. The Behavioral Risk Factor Surveillance System is the world's largest telephone survey. It is used to determine the commandments of many health risk behaviors within populations. Surveys were developed and conducted until middle of paper......ion, March 19, 2013. Web. March 17, 2014. Eyler, Amy A.. Environmental, political, and cultural factors related to physical activity in a diverse sample of women: The Women's Cardiovascular Health Network Project. New York: Haworth Medical Press, 2002. “Sex Grouping” in print. BRFFS prevalence data. Np, and Web. March 17, 2014. .Hoban, Mary and Valerie Hartman. “About ACHA-NCHA.” About ACHA-NCHA. Np, and Web. April 4, 2014. “Revenue Consolidation.” BRFSS prevalence data. Np, and Web. March 17, 2014. Welter, Trisha. "Student Health | University of Iowa." UI health data. Np, and Web. April 4. 2014. .