Okay, I was JUST going to post something about this (HOW WEIRD!) I starting poling in 2008. I learned to invert incorrectly (by kicking) so I never learned to use any muscles to invert. I also learned the shoulder mount the same way. I have literally been struggling for the last YEAR to get my invert (with total frustration.) I would try for a while, give up, move to something else, go back to it, give up, move on to something else, and go back to it. I recently started taking a silks class and was struggling with inverting in it too, so I figured I cannot put it off any longer. I've been trying for about 3 months to figure out what muscles are the weak point and I finally figured it out! MY HIP FLEXORS! So I started working on those for the last few weeks. I turned on my camera just now, tried an invert, and GOT IT! It wasn't perfect, but it was an invert, and I was able to reporduce it! You should have seen the look on my face on the video! I looked so baffled! HAHAHA! 😮