A strength machine designed for exercising the quadriceps muscles in a sitting position. The device has a 5-step pneumatic backrest adjustment. The applied pneumatic actuators allow for easy adjustment of the elements by the exercising person without having to leave the device. The machine also has a 6-stage angle adjustment of the arm (used in rehabilitation) and a 7-stage roller adjustment. A two-color system is used in the control elements, of which yellow means pulling the element, and orange – pressing. The structure of the device is made of a flat-oval section with dimensions of 125x60x3. The stack covers are made of profiled sheet metal. The stack is equipped with a magnetic load selector. The upholstery elements have been adjusted to the anatomical shapes of the exerciser, which contributes to the comfort and safety of use. An additional advantage is the unique BWT load transfer system, which protects against injuries resulting from muscle overload, and also ensures an increase in the effects of exercise up to 30%.