Judo
The problem with many fighting arts is that they are unregulated. there is no national organization overseeing the training that Jujitsu instructors receive for example. A blackbelt in one place is not a blackbelt in another and safety considerations vary. In most cases you need to go by word of mouth as to how good or bad a particular Dojo is. but as an olympic sport Judo is a very structured and well regulated envirnment from the local to international levels. a brownbelt in the US is a brownbelt in the UK thay have the same siklls, only technique varies what you need to do and know to advance is the same. most Judo clubs are non-profit so the price tends to be lower in Judo. that aside it's real fighting every night, this is the real thing, my daughter (14) could throw most anyone if she caught them unaware I don't encourage it, but it's kind of nice to know she could in case some boy trys to grabbed her. as far as excerise goes it's one of the best, full cardio, resistance training, balance, stamina, teemwork, individual acomplishments, respect, certified instructors, the works. My daughter thinks she plays Judo for the sport and i love it too, but in my heart of hearts it's for the self-defence that i'm happy to take her to the class and meets and pay the 50 dollars a month.