Erector Spinae muscles can hyperextend lower back more than usual if abdominal muscles are weak. The abdominal muscles tilts pelvis forward improving the mechanical positioning of the Erector Spinae, specifically when the lumbar spine becomes straight. Iliopsoas can pull on spine during hip flexor activities if abdominal muscles are weak. Risk is compounded when abdominal weakness is combined with hip flexor inflexibility . Straight Leg Deadlift Supraspinatus Weakness Increased risk of shoulder injury during shoulder flexion and abduction activities, specifically when elbow travels below shoulder.
Risk is compounded with a winged scapula condition .
Front Lateral Raise Infraspinatus Weakness Increased risk of shoulder injury during shoulder transverse flexion and transverse adduction activities, specifically when elbow travels behind shoulder. Risk is compounded with a protracted shoulder girdle . Strengthening of the rear deltoid and long head of the triceps brachii can help stabilize shoulder, although to a lesser extent as compared the infraspinatus. Back extension exercises involving complete lumbar spine range of motion have demonstrated primarily excellent or good results for those with chronic low back pain. A rational approach to the treatment of low back pain.