This study examined four physical educators' teaching behaviors before and after an intervention. The study was conducted over the span of three 15-week academic semesters. Phase 1 of the study involved videotaping the participants' instruction prior to intervention. In Phase 2, participants were involved in two workshops planned to convey teaching strategies related to promoting critical thinking in physical education. In addition, participants and co-investigators team-taught three sample lessons focused on incorporating teaching behaviors attempting to foster critical thinking. Data collection was completed during Phase 3 by videotaping each teacher during one unit of instruction. A chi-square analysis of post-intervention data revealed that all four teachers' observed instructional behaviors differed significantly from that expected. Results suggest that the intervention employed during Phase 2 was successful in helping teachers modify their instruction to promote critical thinking in physical education.