â¢It allows you to temporarilly disconnect your wiring from the telephone company's wiring for troubleshooting purposes. Generally, the demarc is located on the exterior of your home in a grey or black box.
Leg Curls. In leg curls, you either sit or lie on the bench, or you stand facing the cables with your legs straight. After securing your ankles under the pad or attaching the cuff to your ankle, you bend your knee to bring your heel toward your bottom.
Considerations. The leg extension is an isolation exercise -- it involves movement at only one joint and targets one muscle group. For a complete leg routine, include compound, or multi-joint, exercises in your workout, such as squats and lunges.