Anatomy Books

“Unfortunately, sitting rests the parts of the body that don’t need much of it while working the parts that desperately do. Specifically, it disengages the lower extremities while utilizing the spine. (This is in sharp contrast to squatting, which disengages the spine while utilizing the lower extremities.) Because sitting positions the spine vertically, it provides no rest or relief from the gravitational forces that compress it. Without a periodic therapeutic reprieve through the day, the relentless load overwhelms the entire structure, joints and muscles alike. To maintain an erect seated posture, some muscle groups in the back have to continually contract. Since this requires a great deal of energy, the muscles quickly become fatigued. (That is why slumping is more comfortable: It takes less energy to maintain.) When the muscles tire, you rely on the backrest more and your muscles less. The less you rely on your muscles, the weaker and more dysfunctional they become. The weaker and more dysfunctional they become, the more you rely on the backrest. The more you rely on the backrest, the more you tend to slump. The more you slump, the more pronounced the debilitating C-shaped curvature becomes. This weakens the muscles in your back even further, which causes them to overload the joints they serve. Sitting in chairs affects even the areas seemingly at rest (particularly the hips and knees). Because sitting keeps the joints static for long periods, the muscles that serve them become fixed in a short, tight position. When at last you do get up and move, the muscles impose more stress on these joints, thereby increasing their susceptibility to wear and tear. The prolonged stasis also prevents the joints from being lubricated with nourishing synovial fluid. Once depleted, the hips and knees, like the spine, deteriorate and erode. Is it any wonder that the areas most traumatized by sitting, namely, the lower back, hips, and knees, are also the most arthritic and disabled areas of the body in the world today? The real mystery is why so few people have made the connection between prolonged sitting and the epidemic of chronic pain. In fact, they need only look to their own bodies for an abundance of evidence.”
― Joseph Weisberg, 3 Minutes to a Pain-Free Life: The Groundbreaking Program for Total Body Pain Prevention and Rapid Relief