Foam rolling or self-myofacial release is known for the principle of autogenic inhibition.
We all have a mechanoreceptor called the Golgi Tendon Organ which is sensitive to changes in tension in the muscles.
When you are at the risk of injury for example tendon rupture, the golgi tendon organ makes the muscle relax.
This muscle reflex is called autogenic inhibition.
This in turn allows for greater range of motion. Basically you have more "freedom" of movement available. You are less tensed. Less tight.
Foam rolling stimulates this organ to relax your muscles.
This means you get the benefits of stretching and more.
Foam rolling offers an effective way to reduce scar tissue and adhesion that builds up every day.
It also plays an important role in correcting postural afflictions.
Before you start rolling, I want you to take these into consideration:
Thoracic Extensors, Middle and Lower Trapezius, Rhomboids
Latissimus Dorsi and Teres Major
Pectoralis Major and Anterior Deltoid