Prevention and Reduction of Obesity Through Active Living

Inclusion Criteria: * Men and women between 25 and 65 years of age. * Sedentary lifestyle (planned physical activity for the purpose of health one day per week or less). * Abdominally obese (waist circumference greater than 88 and 102 cm for women and men respectively). * Weight stable (± 2 kg) for 6 months prior to the beginning of the study. * BMI between 25 and 34.9 kg/m2 (Because a lifestyle-based intervention alone for obesity reduction is ideal for persons with a BMI greater less than 35, and, that 94% of overweight and obese Canadian adults have a BMI between 25 and 34.9 kg/m2, subjects with a BMI 35 or greater will be excluded). Exclusion Criteria: * Physical impairment which would make the intervention very difficult, or unsafe according to the patient's physician including history of myocardial infarction, stroke, coronary bypass surgery or angioplasty in the last 6 months; peripheral artery disease, unstable angina or ischemia, uncontrolled or insulin dependent diabetes mellitus. * Alcohol consumption \> 21 drinks per week. * Plans to move from the area. * Participating in another research study. * Clinically judged to be unsuitable for participation or adherence * Inability or unwillingness to provide informed consent. * For women, planned pregnancy in the next 3 years.