This seated row machine targets your back muscles independently. Muscles include Teres Major (outer back), the Latissimus Dorsi (middle back), the Rhomboids, the Middle and Lower Trapezius (upper back), the Erector Spinae (lower back), the Pectoralis Major, the Lower Chest Muscles, the Posterior Deltoids (shoulder), the Infraspinatus (shoulder), the Teres Minor (shoulder) muscles. Pivoting flex handles reduce wrist stress and help prevent injury; Diverging motion is ergonomically correct; Gas-assisted seat adjustment fits users of different sizes; Chest pad adjusts to suit different arm lengths; Cold rolled steel weight stacks with noise dampening; Stainless steel guide rods resist rust and stay smooth; Kevlar belts for quiet, smooth action and optimal tensile strength; belt contains 2200 lb (998 kg) tensile strength aircraft cables; Marine-grade double stitched upholstery.