In slacklining, you balance your way across a flat rope, similar to tightrope walking. Yet the difference is in the type of rope and its tautness, which altogether can feel more like a really thin ...

Or more accurately, slacklining — a sport in which users string a wide, flat line between two trees and walk across it. From “highlining” (rigging the line 20 feet in the air or higher) to ...