A motion detection system (100) comprises a sensor (106) arranged to detect a movement pattern of a movement occasioned by a user, and a control device (108) arranged to receive movement data representative of the detected movement pattern. The control device (108) is further arranged to compare the detected movement pattern data with movement pattern data representative of a predetermined movement pattern and to determine a coherence parameter representative of the coherence between the detected and the predetermined movement pattern. The control device (108) controls a feedback device (110) for providing feedback to the user on the basis of the determined coherence parameter.