Prone Y Raise is an excellent rehabilitation exercise which targets your lower trapezius. To perform it, lie flat on your stomach. Rest your head on the floor. Create a letter Y with your body, by keeping your arms overhead. Now lift your arms from the floor and hold this position for a few seconds. This movement will also engage helper muscles like middle trapezius and posterior deltoid, but the main focus will go to lower trapezius, which works on a really long lever, trying to bring the scapu

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