Trying to Crawl

Anna has been trying to crawl for a while now. She just can't seem to get her legs and arms up at the same time. The other day, she would get up on her knees and try to crawl, but she just couldn't seem to move. I know I shouldn't want her to crawl because I know once she does, I will be chasing her all over the house. I am just excited about it though!