I just started to try to learn how to ollie a couple days ago and I have the pop and the drag down, but I can't get my back foot to stay on the board. Every time I pop, my back leg reflexively bends and I can't bring the board back under me to land. I tried to fix it but I just end up standing on the tail or I mess up the pop because I'm focusing too much on keeping my back foot on the board. Does anyone have any tips that would help me with this?