anyone experience with this self defence sport? i am not planning to learn this because i want to fight, but because of hardening my psyche. moreover, i wanna loose the fear of getting physically hurt. how much do you get fucked up during training? (once i joined a karate class and all we would do was punch the air around us. lame)

today i could join a trial training, but since i had a mild brain concussion on friday i am not sure if i should wait some more days.