In the following video there is nothing special, just regular hard daily training... However, I guess it is special as it is behind the scenes, which normally is not shown.
In sum, pertaining to this training, kihon until the body fails is imperative, as 'flashy instruction', lots of talk, and 'feelings', are now commonplace in the world. Needless to say, this theoretical karate will break under overwhelming strength. This is the technical essense of Budo Karate. That is, the Martial Art of Karate-Do.