VIDEO CREDIT: Restore353
The Serratus Pump or Serratus Push Up is an exercise that strengthens the scapular stabilizer: the serratus anterior.
Begin by kneeling on the mat in quadruped on the hands and knees, or alternatively on the elbows and knees. The hands should be slightly wider than shoulder width apart and the shoulder slightly extended. Pushing into the hands, abduct the scapulae, then adduct the scapulae. Feel the movement of the scapulae around the thoracic spine, or the ribcage, without allowing the upper trapezius to contract.