The last person did cut his leg quite badly if you watch carefully and I don’t think you can do such things without injury. I thought martial arts was about improving your health, not destroying it for fame. On a similar note I met a Chinese herbal doctor from Henan, same village as Shaolin temple. I asked her why I only see young shaolin monks perform stunts and what is the physical condition of the older monks. She told me that many of them suffer with arthritis and other health problems but that it is kept quite, she personally treated many of them. I wonder if I did such things as a young man would I look back as an older man with health problems and say "it was worth it", I don’t think so.