The interesting thing about this line of inquiry is it has made me re-examine how I came to be interested in the subject in the first place. I was recovering from a hernia patch and unable to partake of any physical exertions. My sister emailed me and asked if I had seen the Russian Ninja on Youtube. I had not. This will tell you a little about the nature of my relationship with my sister. Not able to get out and run and jump and play. She knows this and sticks it to me by suggesting I check this out. Anyway here is the video that started me on my path.