Inactive lifestyles have a huge cost to Canadians' health, our economy and healthcare system (3.7% of total healthcare costs, 2009=$6.8B19). If 10% of Canadians were more active, 25-yr healthcare costs would drop by $2.6B, $7.5B would be added to our economy, \& 550,000 fewer Canadians would live with chronic disease. Congenital heart disease (CHD) is the most common congenital condition (12/1000 births) and a major health burden. 90% of CHD children live 4 to 8 decades with a 3-5X higher risk for atherosclerosis, anxiety or depression. Physical activity is known to decrease these important health risks. \<10% of Canadian children are active enough for optimal health and, regardless of severity, CHD children are even less active. Individualized kinesiology support can improve physical activity (PA) skill, confidence and participation among CHD children but exceeds current clinical care resources. In response, our team of patients, parents, and clinicians developed a "tool kit" of 12 child/family-friendly PA resources to enable clinicians to better address the most important PA issues for these patients. Our randomized, controlled trial will evaluate a clinical practice change (systematic PA counselling with the PA tool kit plus PA in CHD database) on patient PA and health system outcomes in small (London), medium (Ottawa) and large (Edmonton) paediatric cardiac clinics. Randomization will be by week within each study site to prevent potential intervention cross contamination between children in clinic at the same time. Primary outcome is daily pedometer steps over 1 week. Secondary outcomes are quality of life (PedsQL), physical literacy (CAPL screen) and PA motivation (CSAPPA). Health system outcomes will be: % patients receiving intervention, clinic visit time, # of non-clinic contacts about PA, and need for kinesiology referral. Patient outcomes will be assessed during the CHD clinic visit and at 6 months, with pedometer steps also measured each month. We will enroll consecutive CHD patients with moderate or severe CHD, 5 - 17 yrs, \& no other diagnosis affecting PA. Based on our data from previous PA studies among CHD patients and anticipating 10 patients/month, we would require 15 months of data collection (10% dropout) to obtain the 136 complete data sets required to provide 80% power to detect a clinically meaningful increase in daily PA of 1000 steps/day. Repeated measures ANOVA will evaluate study group impact (control/intervention) on pedometer steps. Secondary ANCOVA models will adjust for age, sex, treatment history and clinic site (Ottawa, London, Edmonton).

Our research team combines expertise in clinical intervention trials (Longmuir) and study design and analyses (Willan) with patient (Graham) \& family (Rouble) experience plus \> 60 years of clinical expertise (Lougheed, Norozi, Mackie). All investigators have previous experience leading multi-site research projects and supervising graduate students. Graham (Can. Congenital Heart Alliance) will ensure intervention relevance and scalability to all Canadian CHD patients. CHEO Family Forum (Rouble) will provide parent input. Through this study, we will advance knowledge of healthy, active lifestyles \& PA support for CHD patients \& the health system impacts of current practice recommendations to promote PA to CHD patients at every clinical encounter.