Key Features: Independent movement in order to make sure a correct training, balanced with a biomechanics design for a perfect contraction Gradual curve movements in order to stimulate quadriceps. Gradual adjustments of the supports. 2 racks reinforced for plate storage. Ultra solid steel chassis. Combination of adapt easily and accurately to the machine two kind of tubes: 76mm diameter circle tube and 100x50mm oval tube; both with 3mm width. TIG welding in all the union points. High durability stainless screws. Ergonomic adjustment lever. The seat adjustment is mechanic with an hydraulic compensator. It has an articulated quadrilateral structure made on steel with the hydraulic aid. Fireproof upholstery made in hi-density polyfoam for more comfort and reliability. High precision industrial ball bearings to ensure smooth operation and protection against corrosion. Elastic adjustments that allow the user to adapt easily and accurately to the machine. Rubber protections on the supports t