How Highlining Works

Highlining grew out of a similar activity known as slacklining. For each sport, athletes attempt to walk down spans of nylon webbing strung between two points. The only real difference is that highlines are suspended dozens or even hundreds of feet in the air while slacklines are hung just a few feet off of the ground. Like the slalom adds gates to make downhill skiing more challenging, highlining adds height to make slacklining more challenging.

Slacklining was a product of Yosemite National Park's rock climbing scene in the mid-to-late 1970s [sources: Rogers, Tracy]. Here, at Camp 4, a campground in Yosemite, climbers found that balancing on parking lot chains, hand railings and ropes tied between trees seemed to improve their balance and strengthen their legs and core. By the early 1980s, Adam Grosowsky and Jeff Ellington began walking on nylon webbing, which climbers typically use to anchor themselves or a rope to the rock walls they ascend [source: Lightcap]. This advancement marked the birth of slacklining as it exists today.

After being exposed to slacklining at Yosemite, climbers Scott Balcom, Chris Carpenter and Chongo Tucker took the sport to Pasadena, Calif., where they set up the first highline in 1983. Suspended under a bridge between two support beams, the line was 22 feet (6.7 meters) long and 80 feet (24.4 meters) high [source: Lightcap]. Here they pioneered some of the techniques still used today, like the use of safety harnesses to protect themselves from falls.

Balcom raised the bar in July 1985 by traversing a 55-foot (16.7-meter) long, 2,890-foot (880-meter) high span at Yosemite's Lost Arrow Spire [sources: Lightcap, Rogers]. Darrin Carter, who became the second person ever to cross this coveted highline in 1993, brought a great deal of attention to the sport in 2001 when he appeared on the television show "Ripley's Believe It or Not." Additional exposure came from advertisements for the outdoor clothing and gear company Patagonia, which featured breathtaking photographs of well-known climber Dean Potter on a highline. Today, Potter still impresses audiences with walks like the one above Enshi Grand Canyon, but a new generation of highliners including Shawn Synder, Corbin Usinger and Damian Cooksey continue to push the limits of the sport.

Highlines consist of two main parts: the line and the anchors. The line is usually made from 1-inch-thick (2.54-centimeter) tubular nylon webbing, which is hollow. At each end is an anchor, which can be set up in a number of different ways but often consists of steel bolts drilled directly into the rock. Because of the tremendous forces placed on this equipment, redundancy is crucial. Highliners typically attach a backup line below the main line, and install multiple steel bolts to help anchor each end into the rock. This means that if one line or bolt breaks, another will be there to save you from certain death.

A tether can also help ensure your safety. These consist of a short length of rope tied to a climbing harness on one end and a solid steel ring on the other. Highliners wear the harness and thread the highline through the ring, so in case of a slip they won't fall far. If you do take a tumble, get ready for the ride of your life as your tether jerks you to a stop, then bounces you up and down like a yo-yo for a few moments!

Just as important as proper highline installation is site selection. You might think that setting up a relatively low highline, maybe 15 or 20 feet (4.5 or 6 meters) high, might be a good way to introduce yourself to the sport, but you'd be wrong. Even if your tether is fairly short, a fall might stretch the highline enough to send you careening headfirst into the ground. Location is just as important as height. Only put up a highline where you have permission to do so. Drilling into rocks on public or private land without the proper approval can get you into a lot of trouble and could hurt other people's chances of getting consent in the future.

When it comes to actually walking on the highline, different people have different strategies. Some wear shoes while others go barefoot. Some find focus on the sounds of nature while others wear headphones and listen to music. All make slow, yogalike movements with their arms and legs to maintain balance and safely reach the other side.

If you're going to risk life and limb walking a highline, why not make a vacation of it? The sport's athletes have set up lines in some of the world's most beautiful places and accomplished some pretty amazing feats while they were at it. With a little practice, you could travel to some of these spots as well and walk some of the planet's most notorious highlines.

Because rock climbers pioneered highlining, many of the sport's premier destinations are also popular climbing spots. This is the case with the canyons around Moab, Utah, which boast numerous established highlining routes. Here, notable slackliner Andy Lewis completed the longest ever "free solo" highline, meaning that he didn't use any type of tether to protect him from a fall. The route, known as "The Great Bongzilla," was an incredible 177 feet (54 meters) long and 200 feet (61 meters) high [source: Five Ten]. Moab is also where Dean Potter walked out on a 900-foot (274-meter) high highline at Hell Roaring Canyon, lept off, and parachuted to the riverbed below [source: Longman].

Of course, highlining is still alive and well in California, the sport's birthplace. Joshua Tree National Park, west of Los Angeles, is home to a rugged pile of desert boulders known as "Hall of Horrors" where a typical highline is 70 feet (21 meters) long and 200 feet (61 meters) high [source: Sahagun]. The world's best highliners also flock to Yosemite National Park where the Lost Arrow Spire remains a coveted route almost three decades after Scott Balcom first traversed it in 1985.

Although highlining started in the United States, it isn't limited to that country. Athletes from all over the world have set routes in places as varied as France, Spain, South Africa, Brazil and New Zealand. In fact, the highest line ever walked was located in Kjerag Lysefjorden, Norway. There, Christian Schou traversed a highline measuring 39 feet (12 meters) long and 3,280 feet (1,000 meters) above the ground on Aug. 3, 2006 [source: Guinness].

So, whether you think highliners are brave or just crazy, you have to admit that what they do is pretty amazing. And who knows, maybe you'll find yourself battling fear and wind gusts on your own highline someday!

I've known about slacklining for a while. During the warmer months, it's not uncommon to see a rope strung between two trees at the university where I work. But I had no idea that some slackliners had taken the sport to a level as extreme as highlining. It makes me wonder, how hard is it to stay on that line? Maybe I'll string one up in my backyard -- but I don't think I'll ever move it much more than a few feet off of the ground!

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