Why the head rest?
There are two reasons for the head rest. Firstly, everyone’s back is a different length. By sliding the head rest you can adjust the rack to your length back. Secondly, it is important to avoid putting your neck into too much extension (back of your head going towards your backâlooking up) as this position can compress important soft tissue structures at the base of your spine. Hence, the very back of your head sits flush on the head rest to avoid this extension of your cervical spine (neck).