Hakuda is the Shinigami version of Hand to hand combat. This art is not used by many Shinigami but it is seen used a lot by members of Onmitsukidó. The art is a combination of many different styles of Martial Arts. Users improve their strength and agility a lot.
The detention unit of the Protection squads must be a master of Hakuda as the place where they work, the maggots den no weapons are permitted to be used, therefore they must be capable to defend themselves and others unarmed. The extent of Hakuda is shown by Urahara when he demonstrates his mastery of Hakuda to Hiyori when they are attacked in the Maggots nest.