Bouldering is a type of rock climbing that doesn’t require a rope or harness because you only climb up to 12-15 feet. You'll often see people walking around Flagstaff or Boulder Canyon with giant pads on their backs, which they place below boulders to fall onto while climbing. Climbing with a rope and harness, what climbers might call "rope climbing," is done with a partner and typically reaches more than 75 feet off the ground.