Gibbon Slacklines are quite similar to tightropes and can be very bouncy. They are used for sport and fun alike, and are an excellent way to exercise. Gibbon defines slacking as "the act of balancing along a narrow, flexible piece of webbing usually low to the ground. Originating in the climbing world, it has become popular for balance training."
It is absolutely amazing what you can do on the Gibbon Slacklines. Take a look at the video for some jaw-dropping footage.