In team sports, mental factors play a vital role. In indoor volleyball for example, various athletes interact with each other in a confined space. In such a setting, it is of great importance, if athletes ar trained, that they control their emotions, especially considering the theory of mirror neurons. For example, the change of the persception of negative situation can be transformed into an entirely positive conclusion at the end.An exercice like the DISG-personality model helps athletes to get to know their own personality and thus contributes to an improvement of the communication within the team. With experimental education exercises, teamwort and cooperation within the team can be encouraged. Mutual objective training contributes t the comprechension of a team an d helps to create a collective focus. Relaxation techniques like breathing exercises, mediation and hypnosis help athletes to react in a calmer and more concentrated way in competitive situations.