Sorry to get too basic, but I have upa/bridging/bump and roll issues of some sort. Everything works fine when we drill it, I think I have it down correctly, but when we roll live I'm like 30% successful against whites and maybe 3% successful vs. blues and purples. Somewhat frustrating. I concentrate on first squirming til my elbows are sort of inside the knees so the mounts not too high, trap an arm, get the feet set with the outside foot closing off one to stop the post and the other foot in the middle, bridge and look over the shoulder in the direction I'm going, somewhat diagonal not straight over, those are what I understand as the basics. It seems to work much easier for other people of all sizes, bigger and smaller, than it does for me. And I get rolled off this way from others like I weigh nothing.