means 130 this configuration allows an adaptation of the area of the body that is exposed to the pressure if the lounger is placed in the leftmost position in fig1 the pressure acts only on the legs and the buttock if the lounger is placed in the rightmost position the pressure in addition to acting on the legs acts also on the abdomen and the hips the work out device 5 is supported by supporting means that allow an ergonometric adjustment to the person irrespective of the position of the lounger thus the position of the lounger may be adjusted independently of the body proportions of the person using the device a seat 103 is arranged on the lounger 130 which is formed as lock element and which in case of use is located between the legs of the person in order to take the different body sizes of the training persons into account the seat is preferably displaceably arranged on the lounger the seat on the lounger prevents the person from being pulled into the housing during the vacuum phase in order to enable an easier entry the device as shown in fig1 may easily be unfolded into two half shells wherein the two half shell elements 132 and 133 are separated from one another in the area of the opening 108 0098.