Serratus anterior against wall - static (Scapular stabilization strengthening, pushing into wall (bilateral), standing)

Stand up straight facing a wall.
Place your hands at shoulder height on a wall.
Keep your arms straight and push the heels of your hands into the wall, tightening your shoulder blades to your rib cage.
Your chest should move away from the wall.
Relax your shoulder blades, allowing your chest to move towards the wall again.
Your elbows should remain straight throughout this exercise.
Repeat this movement.