The Serratus Anterior is important because it helps to stabilize the scapula (your shoulder blade) when the arm moves into an overhead position. Starting to strengthen these muscles in this position can be difficult, especially if scapular stability and control is limited, but will lead to improved overhead movement and decreases in pain. This is because the Serratus Anterior helps to rotate the scapula whenever you reach or lift overhead.
You can start in a low or high plank, making sure that the core is engaged and stable. Allow the chest to sink towards the floor, and let the shoulder blades drop towards each other, and then pushing your elbows (or hands) into the floor, allow the shoulder blades to push apart and the upper back to round out. Slowly return to a plank position and repeat the movements.
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