THere is a man named Vadim Starov , he founded the systema fighting system used by Russian Special Forces ( Spetsnaz ) . He also has youtube videos . Despite the language barrier to the viewer , you can still get some ideas of what is being shown , like marshal arts , it would take years , but still . There is a lot of using your enemy’s energy and aggression against him , rendering them flat footed or useless ( then dead ) . He teaches that all of your body can be a weapon , not just the hands and feet . Kind of an interesting thing , he had six of his students place themselves at the landing of a high story apartment building staircase , one student on each landing . He told them that they could use any means they wanted to , such as hitting him grabbing him , whatever they wanted to do , to stop him from going past them to the bottom of the stairs , but he would not hit or hurt them in any way ……….all they had to do was stop him from going down …………….they couldnt do it . He started down at a brisk walk and didnt skip a step hardly , the way he moved , they just couldnt get a grip on him ……again their own energy against them . Fun to watch .