Laurentkd
Master Black Belt
I disagree.
I have put it on my resume and have gotten my last two jobs because of it.
The first one was an industrial plant. I put it on there as a filler and the HR lady was fascinated by it. It was all she wanted to talk about and I got the job. Later, I found out that the ma stuff made me stand out and showed that I was a dedicated person.
For my job at the middle school, it showed that I can teach a room of kids.
AoG
I have a similar experience, but mine was when I was applying for college. As Andrew said, I didn't focus on my rank, but rather how much volunteer time I have spent teaching, how I have organized large events, taught classes for schools, church, etc for community service, and so on. When I went in for my interview for a full ride scholarship, my martial arts experience was all they wanted to talk to (to the point that I tried to also bring up my athletic and musical involvement in high school as I was afraid I would end up looking one dimensional). They must have liked it though because I did get the scholarship.
Other than I have only applied for one "adult" job (since my MA instructor already knew who I was!) and that was for substitute teaching. I included it as how many years I have instructed kids so that it would show my teaching experience with children K-12. Don't know if it made a big difference, but I thought that it was experience with teaching kids that others may not have so why not.
As others have said, I would try to include it in a way that applies to the job you are applying for, either by showing leadership, organizational abilities, etc. rather than just listing the fact that you are in the martial arts.