A Return to Another Theology of the Body, Part 4--On the Morality of Crawling and Scuba Diving
Let's think for a moment about how we get around. Human beings are clearly designed to walk upright. Our spine is optimized for an upright posture, and is on a relative basis stronger than our quadruped cousins to handle the higher load at the top of the body. Our head is set on top of the spine in a manner that has us looking forward naturally only when standing upright (and, conversely and unhelpfully, looking down when on all fours). Our hips have a different design than most four-legged mammals, allowing for a greater range of motion but putting our legs in an awkward position relative to our torso if we are on all fours. Our arms are shorter than our legs, forcing us either to "walk" with our knees as points of contact (which they are manifestly not designed to do), or else to arch our backs in an awkward and unstable posture. Our hand bones are small and fragile, clearly not designed to take the repeated pounding involved in being a point of con...