Jacob Spera owes a lot to full face helmets. The extreme unicyclist loves a challenge but some challenges can be too big, as this video proves. Here Jacob is captured doing some free-ride unicycling, also known as r mountain unicycling, around Colorado’s Lake Pueblo. All was going well until this tricky rock jump. But, luckily, Jacob was just fine after the crash and only had to pull cactus out of his side. Credit: Jacob Spera.