The invention concerns a method and a device (1) for determining a position of a body portion (2) of a user (3), the device (1) comprising a camera (4) configured to capture the body portion (2) of the user (3) to obtain a pictorial representation (5) of the body portion (2) of the user (3), and a display (6) for providing visual feedback to the user (3). The device (1) further comprises at least one sensor (7) for determining at least one of a roll angle, a pitch angle and a yaw angle of the device (1), and an interface (8) for receiving picture data related with the pictorial representation (5) of the body portion (2) captured by the camera (4) and for receiving sensor data related with the determined angle of the device (1) determined by the at least one sensor (7). The device (1) further comprises an analyzer (9) to analyze, based on the picture data, whether the captured body portion (2) is within a predetermined region of the picture captured by the camera (4), and to analyze, based on the sensor data, whether the roll angle and/or the pitch angle and/or the yaw angle of the device (1) is within a predetermined angle range.
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