That O'Hearn dude is the same height as me, 6 ft.3.

I woulda thought it's hella hard to have muscles that big when you are that height because of having longer arms and shit.

Current routine is 2 sets of 20 reps with 20 kg (I think) weights every day and walking 2 hours every other day.

I invoke my right under the 5th amendment of the United States constitution and decline to answer the question.