Hey I recently got my BMUs, I found this video extremely helpful: https://www.instagram.com/p/DRtRLU3EjPf/ It's a much different form than what 99% of crossfiters prescribe, but I found that I am able to do BMUs with 3 RPE effort. Before I was doing more of the "Strong Arch/Kip/Lat pulldown" approach (like 10 RPE). And then this one I'm doing a dead hang in the beginning.... super loose. like 1 RPE.,,, then I snap and stuff and go over (3 RPE).. It's a bit of a mindfuck. (How do you go over when you're so loose in the begining? impossible). But then once I got one, it changed my world lol. I was able to string 4 in a row shortly after. The key thing I noticed was the tenser I was, the worse my BMU was, during the hanging portion. So i would literally tell myself to relax as much as possible. Be 10/10 loose. If i am 7/10 loose, my bmu looks drastically worse. Maybe try it yourself and see if you can get the "Loose BMU" but it's definetly worked for me, I was struggling with BMU for an entire year. tried everything (strength, strong arch kip stuff) and this unlock got me 4 linked in a week, and now super consistent.