Buy a heavy gun that should give you work out and help you defend yourself

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Replying to:

I am considering studying a martial art mainly for self defence and physical fitness the arts in my area are Taekwondo, Aiki jijutsu, and Karate. Which of these would be the best art to study? I was leaning towards TKD because the club offers classes every night of the week where the other clubs only offer classes twice a week.