Sebastiao Liparizi
Martial Artist praticioner of Kenjutsu, Amatheur Boxer.Author has 136 answers and 39.9K answer views2y
Well, they're all quite different, but that's start by their similarities.
They are all Gendayryu, sporticised martial arts born from militarized martial arts created after the
Meiji Restoration.
Judo and Aikido have a common ancestor on Ju Jutsu. Ju Jutsu itself was a counterpart of Kenjutsu mostly divized to kill opponents on armor on the battlefield, disabling and finishing them on the ground usually with a dagger (Tanto) much like as we see see on historical western fencing with armored combatants.
On de "Do" form, Judo takes a more aggressive and active approach on the disabling part, and Aikido kinda waits for the opponent moves to use their own strength to wave them off. I personally find Judo more effective and competitive as Aikido doesn't even have popper competitions and is often not sporticised.
Karate is a martial art focused on bare hands and unnarmed combat. It is meant to be an effective way to deal unnarmed against an opponent (hopefully unnarmed too, but not exclusively).
Kendo is the sporticised version of Kenjutsu which is Japanese medieval fencing. Kenjutsu
not only dealt with swords, but traditional schools as Katori Shinto Ryu or Musashi's Hyoho Niten Ichi Ryu not only teaches swords but they encompasses also medieval Ju Jutsu and
a plethora of medieval weapons like Spears (Iari), Japanese Hallberds (Naginata), Staffs (Bo and Jo), throwing weapons (Shuriken) and some even teaches Kusarigama (Chain Scythe).
Kendo focuses exclusively only on some specific aspects of the sword, and a very few instances (Kamais) compared to Kenjutsu. On Kendo competitions only three stances are used, and is mostly focused on Chudan, with Nito and Jodan being rarely used and frequently frowned upon, among more than several dozen more on Kenjutsu.
So to summarize it all, Karate is a sport focusing unnarmed combat, Judo is a sport focused on disabling the opponent, Aikido is also a martial art focused on disabling the opponent in a more passive way than Judo, and Kendo is a sport focused on fencing with sparring swords. They are all descendant from militarized martial arts used on battlefields centuries before them.
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