Vielleicht von Interesse, damit wir diesen Typen endlich mal abhaken können...:
Lol at the uneducated people in the comments jumping to conclusions, this guy isn't a Karate instructor. How about you actually understand the real story behind this before you start getting emotional and making silly comments. Learn who he is first and learn that these guys knew exactly that this is the training. His name is Satoru Sayama (He was a famous pro wrestler and MMA promoter) and he is well known in Japan and the students knew exactly what they were signing up for.
So this isn't a case of some random martial arts kids coming to learn Karate and getting hit into, so in future don't jump to conclusions.
"Ruhig bleiben und dann, wenn der Typ nochmal aufsteht, dann trittst Du ihn voll ausm Bild!" - Bruce Lee