1. Aims of the study: In 2005, the number of deaths attributed to cancer surpassed those caused by major cardiovascular diseases as the number one cause of mortality in Canada, and to this date, continues to significantly impact the lives of Canadians. As a response to the societal and individual afflictions from disease, it is imperative that research initiatives become more focused in the area of primary prevention. Reports have shown that at least half of all new cancer cases and deaths worldwide can be prevented. The largest impact on cancer development are lifestyle variables such as physical activity. Reviews and meta-analysis show a strong inverse linear relationship between physical activity and many of the most prevalent forms of cancer including breast, lung, and colon cancer (i.e., the more an individual exercises the less likely they are to develop cancer). Unfortunately, over 80% of the Canadian populace fails to meet these recommendations. To compound the problem of low physical activity prevalence, the largest declines in activity may occur early in life. Obviously, regular life-long physical activity is the desired outcome for lowering the risk of cancer; thus, promotion efforts targeting critical transitions to physical inactivity early in life are paramount. Two such groups are parents and their children, making family-based physical activity initiatives arguably the most important target for disease prevention. Unfortunately, physical activity interventions focused on the family home are limited and have resulted in negligible changes in physical activity for both children and their parents. Improvements are required in terms of the innovations of interventions.