For participant safety and to ensure proper technique is developed, Judo should only be practiced under the supervision of a qualified instructor.
Kansetsu waza (Joint techniques) when fully applied are designed to separate the joint being attacked. The elbow joint is the only joint which may be attacked in randori (free practice or sparing) and shiaia (competition).
Ude garami - Arm entanglement
Ude hishigi juji gatame - Arm crushing cross lock
Ude hishigi ude gatame - Arm crushing arm lock
Ude hishigi waki gatame - Arm crushing armpit lock
Ude hishigi hara gatame - Arm crushing stomach lock
Ude hishigi sankaku gatame - Arm crushing triangle lock
Ude hishigi ashi gatame - Arm crushing leg lock
Ude hishigi hiza gatame - Arm crushing knee lock
Ude hishigi te gatame - Arm crushing hand lock
Ashi garami - entanglement