Zip Lining is a recreational activity in which the participant travels down a cable, which is on a decline, while being attached to a pulley that is propelled by gravity.

Zip lining is an activity that allows the participant to use gravity to travel across distances. Distances and heights vary based on the set-up, and range from a few feet to a few thousand feet. Some zip lining can be dangerous, especially that which occurs across forest canopies. While zip lining, safety equipment should be used at all times and should only occur under the supervision of a trained professional.

Use gravity to travel across distances while suspended to a cable.

All rules and regulations relate to the general safety of participants.

The concept of zip lining was first introduced in the late 19th century. The second half of the 20th century saw zip lining appear in a number of forms, including small set-ups for children and large scale courses for professionals. Today, zip lining is popular in tourist destinations featuring large tree canopies.

Cable
Gloves
Helmet
Pulley
Safety Net

Zip lining can be extremely dangerous due to the great heights it's often associated with. One should always wear proper safety gear and never proceed without prior training from someone with experience.

Zip lining participants must have strong arms and an ability to deal with heights and motion sickness.

Flying Fox - a small-scale zip line typically used as a children's toy

Pulley -a wheel with a grooved rim around which a cord passes; changes the direction of a force applied to the cord

http://en.wikipedia.org/wiki/Zip-line