Sublime

Side-bending was still the preferred method of movement, however; fins eventually became legs, acting at the apex of the side-bending curve and increasing the leverage of side-bending propulsion. The intercostal muscles (the group of muscles between the ribs) in lizards act as both respiratory muscles and locomotor muscles for side-bending. This is

The gross curve of your spine is created by the position of the vertebrae relative to each other. In the case of hyperkyphosis, the vertebrae can be rotated or slightly sheared forward, which means that these are the motions necessary to UNkyphosis (image bottom left). Lifting the chest is simply displacing the entire curve relative to the ground.