The Green Light Reflex is the reflex used in forward movement.
The large muscles of the back contract to move you forward in walking, running and standing. The back muscles can sometimes stay over-contracted, pulling the back into an exaggerated arch. This reflex is an arching reflex, like military people standing at attention or people ready for action, busy go getter people, athletes etc.
These green light muscles are working to do what you need.
If this reflexive response to stress continues regularly, conditions such as herniated disks, neck pain, shoulder pain, and sciatica can develop.