[kenzo242]

I don't know how much anatomy urban has studied but rounding the thoracic spine under sub max loads can injury the musculature of the upper back and also the neck. When you lift, no matter what the exercise, you need to keep you chest up and shoulder down. Think of a soldiers standing before their drill Sargent with perfect posture. That's how yuo want your back to look while bending over to do swings, deadlifts, lying on your back and benching. Look up Postural Stabilization on google and you'll see lots of research on the topic and examples of why it's important. Bad posture in the upper and/or lower spine is not good and leads to injury in those areas. If you have any formal training or studied anatomy you would understand that. LAte