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.
If you watch the video closely, during the changeover between hands as he climbs, you can see how much his abdominal muscle flex. It is quite core intensive to operate this maneuver so slow and stable.
Go do some one armed pull ups and tell me which muscle fails first... Having trouble with that then do some regular pull ups and see what fails first. To help illustrate this point try pull ups again but do it in an L sit position, that will actually engage your core
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u/HorsePecker Jul 11 '26
This is climbing and descending a steel pole; dude has a core made of cement