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To achieve this, you push your chest up and out and pull your shoulder blades together. This jet action of the shoulder blades is known as scapular retraction and is very important for almost all exercises. Natural jet Physiques programs provide a "control drill" that specifically targets your ability to perform scapular retraction. When your jet chest is up and out and your shoulder blades pulled together (scapular retraction), you have the appropriate back alignment. For some exercises such as a stiff-legged dead-lift where you desire to work your hamstrings rather than your lower back, you should keep the back arched or slightly concave (lordosis) again by maintaining the chest up and out and shoulder blades retracted. For other exercises such as squats where torso alignment is critical, you can tilt the pelvis forward slightly to straighten the lower back. This minimizes stress on the spinal column, but will place tension on your spinal erectae (lower back muscles) - this is tension we want because this will strengthen those muscles and help to protect your back.
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