Abstract: A motion monitoring system can detect and identify motions of interest in motion data. The motion monitoring system can identify instances of the motion of interest in the motion data and can train a machine-learned model for identifying or characterizing motions of interest in motion data based on extracted features from the motions of interest. The motion monitoring system can also monitor motion data from a user and can help the user alter the performance of the motions of interest. For example, the motion monitoring system can generate an improvement strategy that helps the user improve their performance of the motion of interest. The motion monitoring system's altering of a user's performance of a motion of interest can be applied to physical therapy, gunfire detection, workplace motion improvement, sports, and driving.