The Body Solid Cam Series Leg Extension and Curl Machine provides you with one comfortable position so you can workout your hamstrings and quads. It features a fully adjustable 7-gauge steel cam that will easily accommodate any user. By pulling the jumbo pop pin, you can raise the lifting arm to a comfortable starting position, sit down and wrap your legs over the 8" foam rollers. You can also press down to perform seated leg curl exercises that will stretch and strengthen your glutes and hamstring muscles. By pulling the pin again, you can lower the lifting arm and position your legs behind the oversize rollers to work the quadriceps muscles through a leg extension exercise. You can use 1" weight plates for resistance giving you an intense workout. Weights and spring collar are not included.