Anatomy of Motion on Instagram: "The scapular push up targets two critical for shoulder health muscle groups, serratus anterior and rhomboids. Start in a plank position and keep your arms completely straight. The movement must come from your scapula, not your elbows. Push your shoulder blades apart raising your rib cage toward the ceiling. This activates your serratus anterior, which wraps around your ribcage and stabilizes your shoulder blades. Now squeeze your shoulder blades together, letting