The development of oral presentation skills requires multiple opportunities to present and receive focused feedback. In typical discipline-based and general-education courses, class time is precious, and even when oral presentations are part of a course, students may receive only one or two opportunities to present with feedback. Here we describe an approach to develop presentation skills with ultra-short, one-minute presentations followed immediately by brief, supportive, focused, public in-class instructor feedback. Feedback is offered as one positive comment ("one thing I liked") and one targeted goal for improvement ("one thing to work on"). The short time frame maximizes the number of iterative cycles of practice, feedback, and implementation of feedback. This approach was used with students in several semester-long courses offering three to eight opportunities to present. Students took anonymous surveys immediately after the course experience and again up to two and a half years post-experience. Over 95% reported that they learned a great deal about how to improve their own presentations by watching other presentations and hearing the instructor's immediate feedback. Respondents reported lasting gains in skills, increased confidence in their public speaking abilities, and all would recommend the experience to others.