Is this crawling?

The end of last week I thought for sure William would be crawling by the weekend. He's been bouncing up and down for several days, moving his knees, just not getting that he needs to move his hands in coordination with his knees. Sunday came and no crawling just yet. However, today he's moved into a plank position instead of focusing on bouncing on his knees. I'm not sure what that means! Almost looks like he's trying to get into a standing position. I'm quite impressed by his plank. I don't know when he picked up the Pilates move, but he certainly can hold it for a good amount of time. Maybe crawling by the end of this week? We shall see.