Armlocks have always played a major role in the ne-waza (ground game) of Japenese Judo & Jujitsu,Brazilian Jiujitsu, Russian Sambo, and now submission fighting and submission wrestling because of their immediate effectiveness.

Armlocks fall under the category of kansetsu-waza or joint locks. Judo teaches armlocks as the third section of the ground work kata in 5 different variations.
This tape series stresses mainly the straight and reverse armlocks also known in Japanese as the juji-gatame and gaku-juji-gatame.

In order to become proficient in the use of the Juji in competition, one must 'ingrain' it into their muscle memory through high repetition with the use of a cooperative partner or on a submission dummy.