Martial Arts?

I use to wrestle in high school. My coach did jiujutsu and judo so naturally we learned a few things from those arts. When it comes to self defense you want to be practical and realistic. Most fights end up on the ground at some point so something like jiujutsu and judo are great for that. Karate, boxing, and others of course are great if it's a stand up fight. You might even want to consider an MMA gym since most do a mixture of those arts and then some.