Loading the weight directly onto the lever provides smooth and consistent resistance from top to bottom on both the Leg Extension and Leg Curl. A swivel lock pin locks the leg lever securely in place to allow for crunches to be performed with comfort. All Workbench machine Accessories are quality built and relatively lightweight for quick and easy in and out access. A knob lock pin tightens the accessory during exercise. The Workbench Accessory Storage Rack (WB-ASR) allows you to store your Machine Accessory when it is not in use saving valuable floor space and keeping your gym neat and organized.