Bill Hartman 29:22–31:10
Yes, exactly. Because there's nothing under the bar, right? So how do I create stuff under the bar? I take both scaps. I compress them against the posterior thorax. I shove you forward. I internally rotate. That's my force producing position, right? I'm producing force up into the barbell. So I'm turning inward. I'm internally rotating. My head's going to go forward because I'm compressing dorsal rostral. I am pushing the lower cervical spine forward and I'm pulling my head back in response to that, but I have to have the expansion anteriorly one because I need IR and I need space. I need an expansive thorax underneath the bar to stack the weight on top of. Otherwise, I can't do it. So again, it's like, when you say, is it the same? It's like, okay, what are we doing? What's the shape that we're creating? How much load is there? If I'm in a, you know what a T pushup is? It's like a, it's like a side plank where your, you know, arms are out to the sides and you're doing the, you know, like, like you go from push-up position and you rotate into the, to the side plank. It's like, how much expansion do you have there on that loaded side? Not very much because there's a lot of pressure there, which means I have to IR that, but if I'm laying on the table and I can expand, then maybe I have a little bit of ER there too, that's going to allow me to move into horizontal abduction. So that's why we can't, that's why I am so adamant about killing this arc concept, right? Which is probably my fault because I drew it on a white board, which is two dimensional. And so everybody says, oh, it's a flat plane and it's an arc. No, it's a space that moves depending on what shape you are.
shoulder mechanicsscapular positionforce productionthoracic expansionarc concept critique