Hacking in martial arts

You don't have to be a computer expert to be a hacker. According to many definitions that hackers use among themselves (like RFC1392, aka The Internet User's Glossary, for example) a hacker is "A person who delights in having an intimate understanding of the internal workings of a system."

So, all you really need to be called a hacker is a love of knowing how things tick. The specialty doesn't need to be programming and circuits. The very authoritative Jargon file says that a person could be an astronomy hacker, for example.