A computer processor of the mobile device may overlay a shape graphic on a fixed area of a screen of the mobile device. A camera of the mobile device may search the fixed area for a ball with a marking. The computer processor may recognize the marking on the ball. The computer processor may calibrate the movement of the ball in the overlayed shape graphic in view of the recognized marking of the ball. The camera may track and may record data pertaining to the movement of the ball. The computer processor may calculate one or more metrics relating to ball controlling abilities from the data. The computer processor may display the one or more metrics on the screen.