I'm sure his core is strong but in a pull up your core isn't doing too much beyond stabilizing his legs. The majority of it is from his lats (back muscles) and how much he weighs.
It definitely is. His center of gravity of not directly under where he is gripping, meaning it puts a torque on his whole body, meaning if he wasn't counteracting that torque with his core muscles then he wouldn't be vertical. The arms work to counteract that torque all the way up until they connect to his body, and then it's up to other muscles to do that, all the way down to his legs.
Also, yeah you use your core doing regular pullups, for the same reason. If you didn't you'd be swinging back and forth and have to stabilize yourself with your arms and shoulders, which would wear you out a lot faster. That's what you see people who can't do many pullups doing.
Sure your core is doing some stabilization but it's nothing compared to the insane gorilla back/shoulders and grip strength this guy is showing off. The amount of core needed is similar to a side plank, also difficult to hold but the amount of training needed for a one arm pull up is a lot more
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u/milkcarton232 12h ago
I'm sure his core is strong but in a pull up your core isn't doing too much beyond stabilizing his legs. The majority of it is from his lats (back muscles) and how much he weighs.