He has yet to roll over on purpose (he did it 2x belly to back about a month ago, but nothing since), and you can tell he's trying to get forward to reach something ahead of him. But instead of propping himself up on his forearms - he can sometimes, but hasn't put 2 and 2 together yet - he flings them behind him like little penguin wings, meanwhile kicking with his legs furiously.
It's adorable to watch, but I can sense his frustration. He's using so much energy for a move that isn't getting him anywhere. I know he'll figure it out eventually, and at least he's strengthening his back muscles like crazy.
Just wanted to share.