Performing the: A Step-by-Step Tutorial Roll Ball Pectoralis Major - Sternal
Lay down on your stomach and position the ball or roller under one side of your chest, targeting the pectoralis major - sternal muscle, which is the lower part of the chest muscle.
Apply pressure and slowly roll the ball or roller back and forth across your chest muscle, making sure to cover the entire muscle from the sternum to the shoulder joint.
Spend extra time on any areas that feel particularly tight or sore, but avoid rolling directly on your shoulder joint.
Repeat this process on the other side of your chest to ensure both sides of the pectoralis major - sternal are properly exercised.