You can set the frequency free from 1 to 120 Hz in our individual training menu “Individual”. Up to approx. 30 Hz you stimulate predominantly your red muscles (endurance), from approx. 80 Hz rather the white, large muscles (maximum strength) – If you are not so familiar with this, we have predefined programs “Fitness (muscle building), Relax (similar to a massage after training or also very pleasant for tension) and metabolism (endurance, cellulite reduction)”.