I'll leave the start if the introduction to someone who knows John Wick well:
John Wick is a retired hitman, and the very best in the world. Instead of being referred to as the Boogeyman, he is referred to as the one you send to kill Boogeyman. He is one of the most feared men in the assassin world.
John Wick excels at hand to hand combat, and especially hand to hand combat with the use of guns and other weapons. John’s signature method is to use Judo or Jiu-Jitsu to leverage an opponent into a compromised position, and then headshot them from point blank range. This kind of fighting is hard to defend against, as letting John get one move in on you can lead to a headshot. John favors using joint locks and throws. While John has fought numerous opponents without any weapons at all, he is a hitman and almost always prefers using weapons in close quarters and hand to hand fights.
Here, John kills a man while handcuffed
Without using weapons and without killing for plot reasons, John beats a group of Russian mafia members after having been in a car that was rammed multiple times, which explains why he looks so tired and hurt at the start. If you want to see the car accidents he was in before this fight it can be seen here.
At this point in the movie, John Wick has a $7 Million bounty on his head and every assassin in the area is after him. As he tries to escape through the subway, he encounters multiple professional assassins along the way at different points, and defeats them all, fighting through injuries that he receives along the way, such as being shot in the stomach twice and being stabbed. One of the assassins is even a sumo wrestler. This is kind of a long video but the fight scenes in this movie are some of the very best I have ever seen, and I think you will enjoy all of the fight choreography and how the multiple fights are spliced together in this scene. It’s important to watch to get an idea of what John can fight through and how skilled he is, as he stomps professional assassins one after the other.
While unarmed, John defeats Ares, a professional hitman armed with a knife
John stomps assassins sent to kill him in his house in close quarters combat, with the use of weapons and hand to hand combat
John shows off martial arts skill and gun skills in close quarters
John Wick is a consistent aim-dodger, meaning he is fast enough to move out of someone’s line of fire before they can pull the trigger. This allows him to consistently fight multiple armed opponents, not get shot, and defeat them whether he himself is armed or not. And when guns are used in close range fights, he is consistently quick enough to physically redirect the shooter’s aiming hand before he can be shot.
John dodges all of Ares’ knife strikes. Ares is a professional assassin, and the head bodyguard for the main villain of the movie.
John Wick is only human, but with these feats he demonstrates what would be considered peak human strength. Snapping a human’s neck with only your arms is impossible in real life. It takes at least 1,000 foot-pounds of torque, force that cannot be generated with the arms alone.
Fights through pain of being shot through bulletproof suit. The suit is the same thickness as a normal one, just with thin bulletproof fabric inside. So while it stops bullets, it is very painful to be shot and John shows bruises when he takes off his shirt later in the movie. In real life, being shot with a bulletproof vest can break ribs, so John taking this kind of damage with a much thinner suit on is very impressive.
Does not even react to being shot twice in the stomach from point blank range, and continues on to win the fight
While recuperating from his injuries, including a stab wound and a broken arm, he defeats Perkins, another professional hitman. John was actually about to fall asleep right before this, but in the video you see his friend wake him up when he sees Perkins by shooting John’s pillow.
Gets hit by a car, then immediately takes on a hitman in a fight with no damage
John is again hit by a car in the middle of a fight with multiple mafia members, takes no damage and wins the fight.
When trying to shoot an enemy, he finds that his shotgun is out of ammo. Thinking quicky, John rams the gun into the man’s chest and holds it there until he is finished reloading.
When he finds himself out of ammo, John throws his gun at an enemy’s face
Uses a bulletproof suit in his second film, explained here
John carries multiple guns and knives, as seen here. He doesn’t have the bulletproof suit at this time, but still has a bulletproof vest.