Powerline PLCE165X Leg Extension & Curl MachineTraining the lower body is crucial for balance, speed and coordination and the best exercises for developing the quadriceps and leg biceps are, without a doubt, the leg extension and leg curl. The machine is designed to allow the user to perform both of these exercise in their traditional upright and prone positions. Weight post is 1" dia. Olympic Adapter Sleeve, weight plates, and collar optional. Dimensions: Weight: 44lb Width: 51. 97in Length: 23.