This essential is intended as a compact reference for issues and aspects related to the innovative training technology of whole-body electromyostimulation (WB-EMS). In addition to background and information on WB-EMS application, in which the authors pay particular attention to safe and effective use, there is a current overview of research results summarizing the effects of WB-EMS on various target outcomes. Finally, a characterization of the market situation, current trends and a forecast of developments in the field of WB-EMS is presented.