A strength machine designed for exercising the leg muscles with a load. It has an adjustable backrest angle, which allows it to be adjusted to the height and needs of the exerciser. The stack covers are made of polycarbonate. The load is regulated by a magnetic load selector. Elements in direct contact with the feet are covered with grooved rubber, ensuring greater stability during exercise. The upholstery elements have been adjusted to the anatomical shapes of the exerciser, which contributes to the comfort and safety of use.