What kind of Discipline and Training did Samurai's had to face?

Question

How did they become so agile and strong? While maintaining such an untrained body?

Answer 1

The sword was considered the 'ultimate' weapon by the Samurai.  So all Samurai had to train and become proficient in the sword.

Yet the Samurai had their personalities too, some some opted to master a second or third weapon such as the spear or bow & arrow.

Some Samurai became masters of the Kusuri gama (chained sickle).

There were also upper level Samurai and lower level Samurai, and the quality of instruction depended directly on the Samurai's social class.  

The Samurai were not just stupid soldiers but educated and enlightened men, so poetry; the Chinese classics (Confuscious); painting (Sum - e); and other liberal arts were incorporated into Samurai Budo.

Answer 2

Watch The Last Samurai with Tom Cruise. Good movie, pretty close to the way it was back then.

Answer 3

You should read Stephen Turnbull's books on the subject if you want all the details. To summarize, the Samurai had nothing to do but train in warfare and martial arts. They were forbidden to engage in farming or mercantile activities. They lives were devoted to the service of their liege lord and in return they were given control of farming land and the rice that was produced on it. The more important in the clan they were, the more rice land they were given. This gave them the responsibility of providing troops during conflict. The more they could feed, the more they had to provide.

They took part in training a good proportion of the time, although they had time to get involved in other activities too. There were a couple of sports like kemari (kind of big team hackysack) and a game on horseback that was a cross between polo and mounted Lacrosse.

Generally, they were well provided for and constant training (which at times was very rough) made them strong and tough.

Answer 4

Japanese Jiu-jitsu.

Best wishes :)***