I trained Kyokushin for just short of 4 years, and the training was pretty damn hard. I was lucky to find a school that wasn't a "McDojo" and the master and lower instructors were extremely skilled. I gave up Kyokushin and hapkido later though to persue Muay Thai/san shou fight competitions. Kinda wish I hadn't now. :shakefist
Haha, speaking of san shou training, I used to have to do these things called "puke drills" in which there were 6 stations set up (calisthenics, kicking, hand striking, throws, falls, and free fighting) and you'd have 2 minutes at each station doing the push ups/situps/wallsits or powerkicking the heavy bag or drilling the focus mits or throwing/being thrown, sparring, whatever, for the solid 2 minutes and you'd run through every station twice nonstop. Needless to say, by the end of the run you'd be sucking air and would have about 1/26th of the power and speed you have when you started, and you couldn't drink any water for about 3 or 4 minutes after you finished or you'd vomit it back up, but it really taught how to pace your tempo and built good cardiovascular endurance. Yay.
I'm not sure you'd want to be part of Choi Baedal's original training routine though. He used to train in the snow for like 6 or 7 hours a day, etc. They didn't use this in the film, but in actuality he brought a student with him for company and to train with and it was so rough that the student ran away.