This is absolutely true. As I work my way slowly and painstakingly up the Krav Maga levels, I’m forever hearing from parents about how their kid memorized and demonstrated the required katas and earned a black belt in karate at the age of 13, at some MacDogo. I passed my 3-hour Level I test this past fall. Adjusting for my age, it was the most physically demanding thing I’ve done since my college football days. (The instructors opened a side door in case someone needed to run out by the trash dumpsters and puke.)I was covered with bruises and could barely hold my head up. If you’re thinking about taking up martial arts, know the truth.