Jack does this all the time. He rolls from his back to his front and pretends to get stuck there. I know he can roll back because he has done it a lot he is just not as consistent with the front to back as he is with the back to front. Anyway, he is get to his tummy and supermans for a while while doing some fussing. When he gets tired he puts his head down and plays with some toys and does a few push ups. It is very interesting to watch. :)
Carter does this...but on his back so that just his back is touching the ground...he hates being on his tummy (except on his airplane)
YES! Noah does this alot.... almost the minute I put him down he will arch his head back and stick his arms and legs out.... he has never really been big on rolling over yet so this is pretty much all he does! He has actually started to pull his legs under him and he does scoot a bit but he definitely does the superman! I think at this stage its absolutely normal