Hey! I saw your comment on my video about the shimmy and chest hooping. Really I don't know exactly how I got it down. Basically I was just trying to get better at waist hooping and I starting to try and speed up the hoop and I got into this more prominent forward-back motion and the hoop kind of guided it's way up my chest—I did that keeping my hands above my head. And then when I got the hoop moving around my chest I'd just duck one arm under  and pull it out at a time. 

I don't know if this helps! But just keep practicing. A lot of the moves I learn I just get them down by just goofing around and trying to learn the flow of the hoop.