Subscription access to the use of a computerized system for estimating and displaying a graphical summary of weight gain and weight loss scenarios arising as a result of an exercise and dietary regime, featuring a computer based monitoring device for monitoring caloric expenditure and recording dietary intake, computer software for analyzing and displaying projected weight gain and weight loss scenarios arising as a result of the monitored caloric expenditure and recorded dietary intake, and a computer network permitting access to, display, and monitoring of the projected weight gain and weight loss scenarios of one or more individuals participating in exercise, weight-loss and obesity, or wellness programs; subscription access to the use of a computerized system for continuously analyzing the functional behaviours of the musculoskeletal and cardiovascular systems of a person engaged in an exercise program, featuring a computer based monitoring device for monitoring physical activity and displaying feedback on the screen of the computer based monitoring device which guides the user through the exercise program; Application Service Provider (ASP) services featuring a human performance database accessible by a person engaged in an exercise and dietary regime via a website accessible by means of a local area network or the Internet, and featuring the graphical summary and display of the projected weight gain and weight loss scenarios of one or more individuals participating in exercise, weight-loss and obesity, or wellness programs