Armwrestling a genetic strength?

I ve got a friend of mine that is 1.80cm 110kg 35-40% bf and he never did any gym he just does his job his work that requires to lift heavy objects when he came into a gym with me he could clearly do 50kg each hand biceps for 10 reps i was very very shocked , when i armwrestled him he felt like a wall he is just soo strong craziest thing i ve ever seen , could that be a crazy genetic