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"When the weight is lowered behind the neck, this exercise excessively flexes the cervical spine and loads the shoulders at the extreme of external rotation. The line of pull does not oppose the muscle fibers of the latissimus dorsi, and this does not maximally challenge the muscle. The behind-the-neck position increases the load on the cervical disks and the risk of spinous process fracture. The exercise puts the shoulder at a mechanical disadvantage that may contribute to rotator cuff injury or anterior shoulder instability. An excessively wide grip on the bar should also be avoided because it may increase shear forces across the glenohumeral joint.
Solution: The safer way to perform the exercise is to sit or kneel on one knee, lean back slightly at the hips, grip the bar slightly wider than shoulder width, and pull it down in front of the head."
Från:
http://www.physsportsmed.com/issues/...feb/laskow.htm
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