Use your feet to push the ground so that your butt goes skyhigh! Oh, and push the ground with your hands too!
Stay in this position for 3 seconds.
AH-TISH-SHOO... And all fall down! Well done!!! You are now a wee bit slimmer!
P/S: Mummy hopes this is a prelude to me learning how to crawl. By the way, right now I can only stay in position, I can't move. hahahahhahaha