First, be a coach in a national or private martial arts school.

Second, go to a fitness club as a coach.

Third, open a martial arts school (or health center) as a coach, or go to other martial arts schools (or health centers) as a coach.

Fourth, be a security guard.

Fifth, be a bodyguard.

Sixth, be a policeman (first ensure that you are admitted to the police academy and other schools to obtain the qualification to be a policeman)