Postural muscle vs movement muscle There's a plethora of weird and wonderful devices on the market to correct posture, from straps to hold your shoulders back to some strange buzzer thing you put on your back that buzzes if you dare to slouch….. Let’s think about the mechanics of this for a minute. Right through the middle of your torso you have a long, flexible bony structure called a spine, supported by long, strong muscle designed to keep it at length. The thing that keeps