This rotary torso exercise machine allows you to strengthen your core by rotating your trunk against resistance. This movement targets your side abs and obliques. Preload adjustment allows easy on/off access; Range limiter makes motion comfortable from start to finish; Lower body rotates to isolate core and hip motion; Gas-assisted vertical seat adjustment fits all types of users; Deep-groove, 5-inch (12.7 cm) shrouded pulleys provide faultless cable tracking; Cold rolled steel weight stacks with noise dampening; Stainless steel guide rods resist rust and stay smooth; Internally lubricated 1500 lb (680 kg) steel aircraft cables provide quiet, smooth operation.