In this video Andor teaches important serving principals, by discussing a study done with regard to the most important things for having success in volleyball. This is followed by a pressure serve drill that brings the point home for the players.
 

 
This is a great video that if you are a coach and do not know about the study, you must watch this video. Also for those coaches that do know about the study this is a great video that will help you bring the point of the study into your practice and use it to make your team better.