The phrase "entire spine" refers to the whole length of your backbone, which includes all the bones, known as vertebrae, from your neck down to your lower back. Full definition
Wiltshire is one of the current players a new Manager should retain but the entire spine of the team needs an overhaul. (justarsenal.com)
Exposing all areas that we tend to close off when we are feeling uneasy or fearful, we awaken the hip flexors, entire spine, throat, and shoulders in this posture. (mindbodygreen.com)
The upper back muscles are responsible for keeping the entire spine braced and stable. (fitnessandpower.com)