Health monitoring allows you to discover and treat health problems early, before the consequences. Many psychological disorders, cancers, metabolic disorders, cardiovascular diseases, lung diseases, and musculoskeletal disorders can be prevented by monitoring health and incorporating physical activity and exercise; for example: depression, breast cancer, obesity, cardiomyopathy, emphysema and osteoarthritis. There are primary benefits that can be received from engaging in exercise or physical activity. One of the main advantages is the reduction of the risk of premature death: “it has been estimated that people who are physically active for about 7 hours a week have a 30 to 40% lower risk of early death than those who are active less than 30 minutes." per week” (Kohl & Murray 2012). It's clear that research has uncovered the importance of avoiding inactivity and that even some physical activity is better than none; due to the dose-response relationship between poor health and amount of physical activity. “Epidemiology is the study of the distribution of determinants of disease and disability in populations” (Mausner & Bahn 1974). It is basic public health science and is a measured scientific control that relies heavily on data and study design. Those who study epidemiology focus on specific populations and how disabilities and diseases affect them. Epidemiological methods have been applied to investigations of infectious disease epidemics, but also to studies of long-term chronic diseases. The Behavioral Risk Factor Surveillance System is the largest telephone survey in the world. It is used to determine the commandments of many health risk behaviors among populations. Surveys were developed and conducted through Monday...... mid-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. Print."Gender Grouping." BRFFS prevalence data. Np, nd Web. March 17, 2014. .Hoban, Mary and Valerie Hartman. “About ACHA-NCHA.” About ACHA-NCHA. Np, nd Web. April 4, 2014. “Income Grouping.” Data on the prevalence of BRFSS. Np, nd Web. March 17, 2014. Welter, Trisha. "Student Health | The University of Iowa." UI health data. Np, nd Web. April 4. 2014. .