Techniques for providing physiological rate coaching by modifying media content based on sensor data are described. Disclosed are techniques for receiving data representing a target physiological rate, selecting a subset of files having data representing media contents to be presented based on the target physiological rate, processing sensor data received from one or more sensors to determine a difference from the target physiological rate, and modifying a presentation of the subset of files based on the difference. In some examples, the rate of presentation is modified. In some examples, the presentation sequence is modified. In some examples, a fading in of one media content and a fading out of another media content may be presented.