The diaphragm seals the abdominal cavity from above, while the pelvic floor muscles seal it from below. The pelvic floor ranges from the pubic bone to the coccyx, and its sides are defined by the pelvis. It consists of multiple layers of muscle which collectively are about as thick as the palm of your hand and are layered over one another in the shape of a funnel. This is how the pelvic floor keeps the abdominal organs (intestines, rectum, bladder, genitals) in position.
The heart of the machine is a pressure sensor, which is incorporated horizontally into the seat. The "sensor tube" detects the intensity of the contraction of the pelvic floor muscles and visualises them on the screen of the machine, so that the training progress becomes visible.
The training consists of a sequence of muscle contractions whose intensity is determined individually before each workout. You sit on the sensor tube and as soon as the pelvic floor is tense, a small dot moves on the screen. By tensing and relaxation you drive with the point along a line so you always have the control of tensing the right muscles.