This study is a comparison of the traditional prescription versus the lifestyle exercise prescription in sedentary adults over 6 months. Biological and psychological parameters will be assessed over the 6 month study. Biological indicators will be assessed pre and post including body composition, muscular strength, endurance, and flexibility, aerobic fitness, and blood tests. Psychological parameters will be assessed pre, mid, and post including self-efficacy, motivation, need satisfaction, physical self-description, leisure-time exercise, as well as all constructs from the thepry of planned behaviour.