In this tutorial, Caroleeena outlines three variations on a chest roll with a hula hoop. She does a great job of outlining the moves to complete the trick, but also goes over some troubleshooting.
Learning to do the Booty Bump is an easy and fun Hoop trick.
You start off with the Hula Hoop going around your body in the counter-clockwise direction. After you get into a comfortable rhythm start to bend over at the waist. Your body is now angled vertically with the hoop. Start bouncing, use your knees, and legs to make your Booty Bounce! You should be bent over, with your back flat. If you are short, you may want to try a slightly smaller Hoop (as doing this move often gets your hoop very close to the ground). The motion of your belly, knees and legs in time with your Hoop allows the Booty Bump to happen easily!