We all have our own interests and hobbies we engage in. Some are completely normal while others are considered to be unconventional or even repulsive. Regardless if some are looked at as odd, there are people that practice their unusual hobbies on a regular basis.
People choose to engage in their strange choice of hobby for not only the fun and adventure, but also for the risky thrill and adrenaline they get out of it. Every time they attempt their act, they are taking the chance of a serious injury or even a fatality. Please do not try any of these crazy stunts at home. They should only be done by experienced professionals with many years of good practice under their belt.