We investigated the effects of a special breathing technique, the “Breathing Retraining technique,” on performance in emergency situations. Participants were divided into three groups: breathing method group, visual task group, and the control group. Participants in the breathing method group performed the breathing retraining technique; those in the visual task group performed a simple visual task, whereas the control group performed any task, before the main task. The main task was the water-pipe game, in which participants clicked a computer mouse in various situations to complete the game using the minimum number of clicks. Results indicated that the breathing method group accomplished the most difficult main tasks faster and more efficiently than the other groups in simulated emergency situations. These results suggest that people can work comparatively fast and efficiently, even in emergency situations, by practicing the breathing retraining technique in advance. Additionally, there were no significant differences between the visual task group and the control group. This result indicates that it is not important that putting merely interval, but practicing the right breathing method improves behavior in emergencies.