I posted this on the Krav Maga page but I thought it would also be relevant here. My son was used in a demonstration of a clinching technique in a Krav Maga class. The instructor pinched off the arteries in my son's neck and proceeded to drag him around the room by the neck. The upshot? Stroke. My son survived but he will never participate in a martial arts class, skiing, or any other rigorous activity for the rest of his life. The club owner has since sold the business and moved to Europe. Remember the term "trusted partner." There will be on way to get compensation for his injury. All that is left is to say...BE CAREFUL!