In the barbell reverse lunge, notice that my spine is neutral and more upright to allow for significantly more core tissue to assist my legs. My shoulders are externally rotated back, and the bar is not on my neck. If you can’t hold the bar in a good spot and your shoulders and back are in pain with your arms way out wide…stop! You will need more thoracic extension, and you should use dumbbells or a front rack position until you obtain it. The RL helps improve single leg strength and power and increases core stability.