For the month of September 2015 I took on the pose of Wheel in earnest to try to conquer this or at least make some progress.
A few years ago (7 or so) I fell while trail running and landed so hard on my face and chest that it torked something in my mid-back. Being a ‘tough’ girl in my late 20’s I figured my body would just work itself out and I didn’t receive any medical care. A chiropractor would likely have been able to pop me back in shape. Instead, I couldn’t practice yoga for almost 4 months (couldn’t bend my back at all) and as it healed my fascia and muscles contorted to protect my injury and now I have uneven ribs and my shoulder on my left side is an inch or so higher than my right. Not ideal. So coming back to a place where I can bend my back has been super slow.
Here are some shots of my progress over time. I don’t know that I am making fast progress, but I am feeling stronger and better able to straighten my arms and keep my knees together better.
I also made a tutorial video to help me develop better form and to possible help others struggling in this pose. Hope it helps you as well.