Viewers held their breath as Nik Wallenda crossed the Grand Canyon on a thin wire. Wearing no harness, he could have fallen to his death if he made a single mistake. Daredevils such as Wallenda make their living performing dangerous stunts. They risk their lives to push the limits of what humans can accomplish while huge audiences watch their every move. Part of the series They Do That for a Living?, Daredevils explores the history of this unusual career, what it takes to join it, and some of the most astounding stunts that daredevils have successfully completed.