The Body-Solid® G8i Iso Flex™ Home Gym is built around the 3-Dimensional Independent Motion Arms. The unique Iso-Flex arms make doing chest presses, shoulder presses, pectoral flys, and resistance ab crunches a breeze. You don't even have to get up, just reach around, move the selector pin and keep going. The G8I goes one step further, for superior leg development, a state-of-the-art, patented leg curl/leg extension station is included.