The technique, called "hooping," became popular in Britain in the middle ages.
Then, in the 1800s, when British sailors observed the hula dancers on the Hawaiian Islands, they noted the similarity between hooping and hula dancing and the term "hula hoop" was coined.
Give yourself a day or two of rest from hooping and start again.
You can also increase your speed for a more intense cardio workout, or you can vary your speed of hooping for an alternative to traditional interval workouts.
You can test your body more by hooping with a second hula hoop.
