A method is provided for tracking fitness data. A server device receives a first instance of fitness data from a first device and a second instance of fitness data from a second device. The fitness data comprises information about exercise activity of a user. The server determines that the first instance of the fitness data was received from the first device and that the second instance of the fitness data was received from the second device. The server selects a preferred instance of the fitness data comprising one of the first instance of the fitness data or the second instance of the fitness data based on a classification of the first instance and the second instance. The server incorporates the preferred instance of the fitness data into a fitness profile of the user.