The Basics
The technique for learning how to hula-hoop using just one hoop typically begins with a waist twirl. Nearly anyone can learn to twirl a hoop around an arm, or even the neck, but true mastery of the hula-hoop requires placing it around your waist. Stand with your feet spaced slightly apart, although some people learn better by placing one foot slightly ahead of the other. Set the hoop in motion in a counterclockwise revolution with your hands, and then match the rotation by moving back and forth with your body. The key to keeping the hoop spinning is to maintain a constant motion.
The Knees
Even those who are able to keep the hoop in motion for a long time around the waist find they have trouble around the knees. Start with the legs completely straight and the hoop placed so that it touches the back of the knees. Place the hoop in motion counterclockwise and then begin moving your knees back and forth so that they meet the rotation of the hoop. You will find it easier to keep your balance if you hold your arms outstretched.
Corkscrews
A very popular technique for the hula-hope is called the corskcrew. This technique is actually quite simple, but can be a very beneficial exercise. As you are twirling the hoop around your waist, reach down with one hand and pull the hoop up in one smooth motion so that you are twirling it over your head like a lasso. This can be done with each hand singly, or you can reach down and bring it up with both hands, so that the lasso effect is done around both wrists at once.
Add a Hoop
Eventually you may reach the point where you want to add another hoop or two around your waist. It's much more difficult to keep two hoops moving than one, and trying to keep five hoops in constant motion around your waist requires tremendous concentration and effort. But it is a terrific exercise. Start thinking about adding hoops when just one becomes too easy.