What kind of training did John Wick undergo to become an assassin?

John Wick is a fictional character in the eponymous movie franchise played by Keanu Reeves. He is a retired hitman who returns to his violent past after the death of his wife. He underwent intense training to become an assassin, which is showcased in the movies.

John Wick was trained as a member of the Ruska Roma, a group of Romani people, and his mentor was a man named Viggo Tarasov. He was trained in various forms of combat, including Judo, Brazilian Jiu-Jitsu, karate, and Krav Maga. He was also proficient in the use of firearms and was known for his skill with a pencil.

The training that John Wick underwent was not just physical but also mental. He was taught to be emotionless and detached, to be focused and efficient in his kills. He was also trained in the art of disguise, as shown in the second movie where he disguised himself as a sommelier to get close to his target.