[otoko]

Wrestling or Judo. Wrestling because it is simple, take someone down to the ground and keep them there. They are highly conditioned athletes and very strong. Judo is good also since they are used to grabbing the sleeve and lapels of their opponent, an untrained person would have no chance once a judoka got his hands on them, they have a vice-like grip. Take them down to the ground and submit them with a choke or jointlock.