A zip line is a recreational activity that involves a cable stretched between two points, usually at different heights. Participants are secured in a harness and glide along the cable, propelled by gravity. Zip lines are often found in adventure parks, forests, or mountainous areas, providing an exhilarating experience while allowing riders to enjoy scenic views. The design of a zip line includes a pulley system that allows the harness to move smoothly along the cable. Safety measures, such as helmets and harness checks, are essential to ensure a secure ride. Popular among thrill-seekers, zip lines can vary in length and speed, catering to different skill levels and preferences.