Crawling frustration: push up

I still get really frustrated trying to crawl. I’m getting closer and can push myself up with my arms, but I still am not moving forward. I don’t get it! Mommy and Daddy say that I have to use my legs, but I though to crawl I had to use my arms. Wait, are you saying that I have to use my arms AND legs at the same time? That’s preposterous! How am I supposed to do that? I have two arms and two legs and I’m supposed to control the movement of all of them at the same time? This is going to be a lot harder than I thought.