Resources for non-teaching jobs in Japan?

I've visited and volunteered in Japan twice.

Currently I'm a personal trainer and certified life coach.

I'm married now, my wife is a Chinese passport holder, and we were thinking of spending some time living in Japan. Preferably without teaching English, where can I find work that would get my and my wife's foot in the door?

Thanks

Your only marketable skill in Japan is that you speak English, so you can only realistically get something in connection to that since there is no unskilled work visa (unless your nationality makes you eligible for a working-holiday one).