A strength machine designed for exercising the three-headed arm muscles. The supporting muscles are the pectoral muscles of the greater and the lats of the back. 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-stage pneumatic adjustment of the seat position, as well as a 2-stage adjustment of the handles. Applied pneumatic actuators allow for easy adjustment of 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.