Question

humans have forelimbs and hindlimbs like a cheetah and deer. why can we not run fast like cheetah and deer

Answer 1

because we don't learn this from birth if we live in them from birth we also do all this

Answer 2

because their shoulders are incredibly rich woth pectoral muscles, the same muscle that powers a birds wings. but, we have antagonistic muscle in our shoulders for heavy lifting and upright stance