An instructor's gestures have an effect not only on students' learning but also on teaching itself. In two experiments, this study tested whether instructors' use of gestures while recording video lectures affected their teaching performance, stress, and cognitive load. In Experiment 1, participants recorded video lectures with gestures or without gestures. As hypothesized, t tests showed that participants in the gestures condition had better teaching performance and lower cognitive load than participants in the no-gestures condition, whereas there was no effect on stress level. In Experiment 2, participants recorded video lectures with either pointing gestures or representational gestures. The t tests indicated that participants in the pointing gestures condition showed better teaching performance and experienced lower stress than those in the representational gestures condition, but there was no difference in cognitive load. Overall, our findings suggest that in the new educational environment of video lectures, instructors should consider using gestures, especially pointing gestures, to improve their teaching and their experience of teaching.