Hula+Hoop!

A hula hoop is a toy hoop that is twirled around the waist, limbs, or neck. Although the exact origins of hula hoops are unknown, children and adults around the world have played with hoops, twirling, rolling and throwing them throughout history. Hula hoops for children generally measure approximately 28 inches in diameter, and those for adults around 40 inches. Traditional materials for hoops include willow, rattan (a flexible and strong vine), grapevines and stiff grasses. Today, they are usually made of plastic tubing.

wikipedia/hulahoop.com