Better learn Mandarin.
Notice pull-up picture, chin above bar, arms fully straight between reps.
I saw Coach Prime challenge one of his players in pull-ups, Prime’s elbows were at 90 degrees, way too easy.
full manual pdf
https://digirepo.nlm.nih.gov/ext/dw/101619477/PDF/101619477.pdf
h/t CharlieFoxtrot