A method for providing a feedback-controlled exercise routine for a user by providing a predetermined sequence of movements for the user; sensing movements of the user during the sequence; measuring data related to the sensed movements; and evaluating the data to determine whether to repeat or modify the routine. The method can also include storing the user's exercise routine on a user key, displaying exercise instructions to the user from the user key to illustrate the sequence of movements, with the evaluation of the data including modifying the displayed exercise instructions, and storing an updated user exercise routine after successful completion of the routine, wherein the updated routine includes the modified exercise instructions.