patterns of physical activity and exercise indicates that there has been an overall trend of decreasing physical activity levels and increasing levels of inactivity among adolescents and adults (Gordon-Larsen, McMurray, & Popkin, 1999; Van Der Horst, Paw, Twisk, & Van Mechelen, 2007). Inactivity and poor diet are responsible a large number of deaths annually and could soon become one of the leading causes of death in developed countries. Research continues to reaffirm that there is a dose response relationship between physical activity and all causes of mortality. There is typically a risk reduction of around 30% for those attaining the recommended levels of at least moderately intense physical activity on most days of the week compared with those who are relatively inactive (Lee & Skerrett, 2001). Regular physical exercise has long been associated with decreased risk of fatal cardiovascular disease (Powell, Thompson, Caspersen, & Kenderick, 1987), obesity and diabetes (Knowler,...
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