Unfortunately, I don't have a way to shoot a video.
Perhaps I'm confused about where the issue really is. It wouldn't be the first time. During the eccentric portion of the lift it felt like my mid to upper back really wanted to bend backwards. Perhaps it is because I don't have the shoulder flexibility that I need, so the stress was being transfered to the spine.
The only other time I've felt this is when doing barbell rollouts. It is difficult for me to keep my spine from over extending. But, not down by the lower spine, more like the mid back just beneath the level of the shoulder blades. So, that should be one of the lower thoracic joints, but I don't know enough to say which one.
It could very well be that I'm lacking flexibility in some other area so the stress gets transfered there. But, thats where I feel the issue.
I've taken this to mean that I lack the ability to resist thoracic extension. Though, I do feel like I have a decent ability to resist spinal flexion (don't have any rounding on deadlifts) it seems like I'm lacking strength in the other direction. Does that make sense?
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