Advance Training & Nutrition (ATN) is a professional wellness company that specializes in personal training and nutritional guidance. It offers personal training sessions in the privacy of clients' homes, at their building's gym, or at one of several studio locations. The staff here includes nationally certified personal trainers, certified yoga instructors, certified Pilates instructors, diabetes counselors, an ayurvedic practitioner and a certified dietitian. General condition training and post-injury rehabilitation are also available. The director of ATN is William Wallis, a certified personal trainer who has been involved with personal training since 2002. He specializes in high-intensity interval training.