I know hapkido, basicly its just how to stop an attack. Like hit the armpit of anyone grabbing things above your shoulders, how to get out of a headlock etc... had few lessons a big while back.
One old expression
Though there are many paths At the foot of the mountain All those who reach the top See the same moon.
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As for hapkido, both founders of hapkido - Grandmoster Choi Yong Sul (born in Korea, but moved into Japan when he was a kid.) and founder of aikido - Morihei Ueshiba learned from one master Sokaku Takeda. They learned - Daito-Ryu Aikijujutsu (Dai = big, to = sword, Ryu = school, Aiki = combined senses, Jujutsu = soft material art) is one style of the old Japanese Ju-jutsu, which first of all uses hand, elbow and shoulder joint locks to defend against various armed and unarmed attacks.
After spending 30! years at Sokaku Takeda household GM Choi returned to Korea and started to train and teach. The fact, that GM Choi’s first student held the first Dan in judo had an effect on the development of Hapkido. All Defense techniques against holds at the wrist, sleeve, collar and against judo throws go back to these roots.
"Endure. In enduring, grow strong."
-Githzerai adage.
