Tom just says that whole "recline in a lawn chair and punch yourself in the foot" thing, which doesn't help for me. I struggle to get my back leg straight as well. Every time I feel like I click a good one, I see a photo/video and it proves to be a bent-leg monstrosity.
I'm going to try and focus more on straightening that back leg and see where it gets me. Appreciate it.
Witness my shame (shitty video grab). I am focusing a lot on kicking my legs forward, but I think it's clear that I'm forgetting about my hips. I feel like I need to pull them to the right as I kick my legs forward and to the left.