A strength machine designed for exercising the muscles of the shoulder girdle (deltoid muscle, arm extensor muscle group). The structure of the device is made of a flat-oval section with dimensions of 125x60x3. The stack covers are made of sheet metal. The machine has a 7-step pneumatic seat position adjustment. The applied pneumatic actuators allow for easy adjustment of the elements by the exerciser without having to leave the device. The stack is equipped with a magnetic load selector. The upholstery elements have been adapted to the anatomical shapes of the exerciser, which contributes to the comfort and safety of use.