A style of Karate developed by Mas Oyama who many consider the god of Karate. It's famous for it's bareknuckle competitions. Early in it's creation the founder of Kyokushin and his students went to Thailand to determine which is the ultimate striking art on earth. Karate or Muay Thai?
Kyokushin has many derivatives such as Enshin, Ashihara, Daido juku, and others. But they all have the same spirit as the same style.
Thaiboxer: Karate sucks
Kyokushin4life: I think you're talking about some other bitch ass Karate style.
Thaiboxer: no I'm talking about your bitch ass. Kyokushin Karate.
Kyokushin4life: that's it let's go!
Challenging a dojo. I can refer to one or more people who basically like the name suggest storm into a dojo and challenge the people who are there. In the modern age it's becoming more uncommon for these things to happen. Which may be a reason for the sudden prevalence of Mcdojos.
Rick: Did you hear how my boy dojo storming that Mcdojo group Shaolin-Do?
Sam: He won right?
Rick: Of course he won against those bullshit artist.
True strength is an insane concept used in martial art storylines: such as movies, video games, and comic books. It really has no basis in reality.
A perfect example of this is Ryu from street fighter. He wanders the world over searching for true strength. Nothing else in life matters.
Mas Oyama searched for it in the mountain tops in a Korean movie called "Fighter in the Wind."
Daizaemon Kaze in the manga Gantz also searches for true strength.
The closest thing we have to a concept of true strength in reality is "he got heart," or "a true soldier."
Whitebelt: What is true strength?
Sempai: Beating Sub Zero in mortal kombat
Whitebelt: Hey I was serious
Sempai: Stupid questions get stupid answers