PEOPLE ARE AWESOME! 2015 (IMPOSSIBLE)
There is an inherent risk in the performance of all stunt work. The most risk exists when performing stunts in front of a live audience. In filmed performances, visible safety mechanisms can be removed by editing. In live performances the audience can see more clearly if the performer is genuinely doing what they claim or appear to do. To reduce the risk of injury or death, most often stunts are choreographed or mechanically-rigged so that, while they look dangerous, safety mechanisms are built into the performance. But however well choreographed exercises they appear to be, stunts are still very dangerous and physically testing exercises.
From its inception as a professional skill in the early 1900s to the 1960s, stunts were most often performed by professionals who had trained in that discipline prior to entering the movie industry. Current film and television stunt performers must be trained in a variety of disciplines including martial arts and stage combat, and must be a certified trained member of a professional stunt performers organisation first, in order to obtain the necessary insurance to perform on stage or screen. This allows them to better break down and plan an action sequence, physically prepare themselves, and incorporate both the safety and risk factors in their performances. However, even when executed perfectly, there is still strain and often resultant planned hurt and occasionally injury to the body when performing stunts. (source : wikipedia