Well, Gorrilas certainly 'lift'. Imagine you weigh 800lbs, how easy would a one armed pull up be? 99% of people who weigh sub 200 can't pull that off. Or try tripling the capacity of your cable row machine. Also remember they more or less run with their arms. Gorillas are constantly 'lifting' their entire lives.
Similarly horses weigh upwards or 1100lbs, try sprinting with that on your back.
As far as the diet for the 2 animals, I would just have to assume its the genetic differences, and lack of 'leisure time'. But that's just guess work.



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