Standing scapula protraction/retraction DR (Scapular protraction/retraction drag resisted, pushing/pulling kickboard, standing)

Stand up straight with the water at chest depth and your feet shoulder width apart
Soften your knees.
Hold a small kickboard vertically in both hands in front of you with your arms straight.
Half submerge the kickboard below the water surface.
Quickly push the kickboard forwards, spreading your shoulder blades apart.
Quickly return to the start position by pinching your shoulder blades together.