system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how apes with a simillar muscle mass are so much stronger than humans.

hey there, been to the zoo a week ago, and was quite fascinated by the orangutangs, the males would hang and pull from one arm with seemingly no effort, and when a zoo employee noticed my awe, he went on and told me about how the males can tear those rhombus fences with their bare hands, and lift logs without help. well, thats amazing. and appearently, chimps are even stronger. i assume our anatomy is pretty simillar, so how is that possible?
gpt
There's a few reasons but functionally most of them come down to finer muscle control. If you look, for example, at muscle bundle innervation we control much finer sets of muscles at a time. Great apes, on the other hand, fire larger bundles at once resulting in stronger but jerker motions. Mechanically speaking there are ask changes in insertion points to control leverage advantages vs mobility advantages as needed. Just watch a chimp doing things that require fine control and they look very clumsy compared to a human. 

Also, keep in mind that there's learned flexibility in both systems and humans can be quite strong and some chimps have learned to be quite dextrous (I.e. The differences of the distributions are further exaggerated by the tendencies of the species). Basically though, you're seeing the result of 6 million years of evolution in support of shorter reproductive cycles &amp; increased intelligence and took use, the musculature and nervous system changes were critical to support those advancements.