Abstract: Managing individual fitness training over a communications network comprising a mobile client device (1) such as a smartphone, a server (2) and a computer program. Upon performing a physical self-testing conducted by the mobile client device (1), the server (2) generates a training plan and provides it to the mobile client device (1). During the training, the mobile client device (1) acquires training data (e.g. via GPS, pedometer, accelerometer, gyroscope, camera), analyses the training, provides feedback to the athlete and supports social networking. Optionally, the mobile client device (1) is communicatively connected to an on-body sensor (3) via short-range communications.