Not karate, but I've been doing Aikido for about 7 years. Last couple of years have been on and off with being pregnant, new mum, etc. Before I fell pregnant I was in training for my black belt. Will eventually go back and finish it off after this one is born. I sometimes teach the kids classes which is a lot of fun.

Any martial arts is fantastic exercise, not to mention all the self-defence, self-confidence benefits!