We had another new student visit the club today. She is a black belt, but none of us knew that until after the lesson - all the way through she trained without a belt. Mental note: this is considered courteous when visiting other clubs.
After half an hour hard exercise we spent a lot of the rest of the time doing ground work. After practicing kata, I think ground work is my favourite aspect of karate training. There's just something fun about wrestling around on the floor. I like the combination of physical and mental exertion: it's like the world's toughest game of chess. You constantly have to think.