Scapula pushups are a great exercise to improve shoulder stability and mobility. Begin in a plank position with your hands directly under your shoulders and your body in a straight line from head to heels. Keep your arms straight and allow your shoulder blades to move together as you lower your chest slightly, then push them apart as you return to the starting position. Focus on the movement of the scapulae, keeping the core engaged throughout the exercise. This exercise is excellent for warming up the shoulders and improving scapular control.