Though I've never been trained or "taught" martial arts, I was introduced to it at a very young age by my father; particularly Jiu Jitsu and Judo (he was a brown belt in both). But recently, I've been intrigued by Vovinam, a martial art born in Vietnam(where most of my family is from), and I've been practicing it.
Here's a demonstration of it(just to throw this out there, my father used to do variations of the sweep around 2:10 on me :^)):