Our shoulder joints have the greatest range of motion of any of the musculoskeletal joints in our bodies. The shoulder joint is really two joints, the glenohumeral joint between the arm bone (humerus) and the shoulder blade (scapula) and the acromioclavicular joint between the acromion (a bony projection off the scapula) and the collarbone (clavicle). The glenohumeral joint is a ball-and-socket joint and the acromioclavicular joint is a gliding joint.
A book cover may not necessarily tell the whole story and may not accurately portray the nature of the contents within. Publishing companies pay high salaries to their marketing staff to create cover copy that will entice prospective buyers to make a purchase. But many times the book itself does not live up to the hype. Similarly, fitness clubs and weight loss programs promote their services by pitching the ideal of slim, well-toned members; happy, young people whom you would be unlikely to ever encounter during your actual real life.
Good spinal alignment means good biomechanical health. Essentially, your spine is the biomechanical center of your body. Your legs are connected to your spine via two large and strong pelvic bones. Your arms are connected to your spine via your shoulder blades, ribs, and numerous strong muscles and ligaments. Spinal alignment supports the functioning of all these associated components. When your spine is in line, then all of your body's mechanical abilities, such as bending forward and backward, twisting and turning, and walking and running are able to be performed at maximal levels.
What is so good about an apple? Is it the color, ranging from ruby red to pale pink? Is it the crunch? The sweetness? Or is it, instead, a combination of all of these qualities, plus the natural goodness derived from the apple's secret ingredients — phytonutrients? If this were a multiple choice quiz, the answer would be "all of the above". Importantly, in addition to possessing numerous appealing physical qualities, apples contain an abundance of health-promoting biochemicals known as phytonutrients.1,2 These specific organic molecules are derived not only from apples but many other fresh fruits and vegetables, and help power the immune system, protect against cancer, maintain healthy eyes, and assist cells in clearing out metabolic waste products such as free radicals.
Young peoples' bones stop growing by approximately age 20, somewhat earlier in women and somewhat later in men. Long bone growth, that is, in the arm, forearm, thigh, and leg, ceases later and smaller bone growth, that is, in the hands, feet, and spine, ceases earlier. In essence, you're as tall as you're going to be by your mid- to late teens, and at the latest, by approximately age 20 or so. A great deal of a person's height is comprised of the length of her or his spine and approximately 25% of the length of an adult human spine consists of the thickness of the intervertebral discs.