Slacklining refers to the activity of walking on a 1-2 inch wide flat rope a few feet off the ground (or higher dependent on personal confidence), utilizing both physical and mental finesse to maintain balance. This past time was first invented in 1979 by a pair of rock climbers. It is quickly becoming popular throughout the US especially within college campuses and among the rock climbing community. Worldwide slacklining is gaining a following and each year the most highly skills athletes come together to compete for the WorldCup title. These slacklining professionals can perform nearly any trick feasible on a trampoline on this 2 inch wide line. Check out the pros in this video: https://www.youtube.com/watch?v=3MdDobR65Oo
My own skills consist of walking on the line, jumping, turning around, and sitting down, however even this takes much practice as most people simply work on standing for more than 5 seconds. This past weekend I introduced slacklining to my host family and it was a huge hit!
If you want to order your own slackline the website theclymb.com generally has discounts but the cost of a Gibbon line generally ranges from $50-$100 depending on length.