Tires â Retreading is less expensive than new tires and is a large portion of this cost. Although mere pennies per mile, an average tire can cost over $250 and annual tire expenses can exceed $4,000 ($0.03 per mile), enough to purchase 16 new tires annually, but still not enough to replace every tire of an 18-wheeler.
With the head in a forward position, a passive tensile force is created in the hyoid muscles resulting in hyoid muscle tension, causing the mandible to be depressed and translated posteriorly. The patient is therefore forced to contract the temporalis and masseter muscles to keep the mouth closed.
Transversospinalis: The Deep Muscles of the Spine. There are three layers of muscle on the back of the body that are associated with the spine and stretch from the pelvis to the head. These deep muscles of the spine are largely responsible for maintaining posture and moving the spine. From my humble perspective few of these muscles are being accessed successfully. If you are familiar with what I am on about, my take is that everyone habitually leans backwards through life.