What athletes' physical structures in the world sports are contrary to common sense?

Bolt's Achilles tendon is 42cm. These legs are made for sprinting. 42cm long is simply beyond the limits of human beings. And in good health. Tai Sen has a thick neck. Tai Sen is the strongest boxing champion in the world. Not only can he hit 800 kilograms with one punch, but his fighting ability is also first-class. His neck is thicker than the average person's waist. The physical structure of these athletes simply goes against common sense.