Squat University Reacts To VIRAL Shoulder Routine!

TL;DR

Dr. Aaron Horchik breaks down Katie Sonier's prone swimmer shoulder routine, explaining why it builds healthy shoulders by activating the lower trap and serratus anterior.

Key Points

• 1.Katie Sonier's routine is a prone swimmer variation. Starting with arms elevated, she performs large circular motions, moves palms up behind the back, dips elbows, retracts shoulder blades, and reverses — bodyweight alone is excellent, but adding weights makes it even better.
• 2.The routine works by forcing key midback muscles to coordinate. The lower traps and serratus anterior must upwardly rotate the scapula; if they fail, the shoulder blade stays anteriorly tipped, creating uneven stress that can cause shoulder, elbow, and wrist pain.
• 3.The prone Y is the recommended regression for beginners. Lying face down forces the scapulas to retract properly, allowing the lower trap to engage — one patient couldn't feel her lower trap on a bench but immediately felt it in the prone Y position.
• 4.Progression must be earned before moving to the incline bench version. If the lower trap is still weak relative to the upper trap, the upper trap takes over; the recommended path is prone Y → prone swimmer on the floor (10 reps) → add weight → then incline bench.