Prior to the actual training of movement in rehabilitation with a medical device, it is often necessary to introduce the exercise and the way the device and/or the training software (program) works, and how the feedback and the movement are tied together. But how can you define the threshold for: the patient has understood the task and is now ready to proceed to the actual training (with less or no assistance). What are feasable markers or parameters (e.g., time to achieve a goal, number of successful repetitions, etc.)? And how can you best show and teach the exercise?