The muscularity of “Jambo The Hairless Chimp” “Unlike humans, chimpanzee muscle is composed of ∼67% fast-twitch fibers (MHC IIa+IId). Computer simulations of species-specific whole-muscle models indicate that maximum dynamic force and power output is 1.35 times higher in a chimpanzee muscle than a human muscle of similar size”- <a rel="noreferrer nofollow noopener" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5514706/" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5514706/</a>