I got into Taekwondo when I was nine, and I started training Muay Thai and Brazilian Jujitsu later in life.
I love the idea of going to work and having to fight and learn a new skill set, whether it's muay Thai or Kali or Filipino stick fighting. To me, it's like college for life.
I'd have to say that Muay Thai is something special. It's really demanding and it's becoming popular all around the world.