THE PHYSICS
Shape does the lifting
Robot experiments showed a hoop stays up only on a body with sloped hips and a curved waist.
Try the shape checkTHE SCIENCE OF A SPINNING RING
Why the hoop
stays up.
A plastic ring, a wiggle of the hips, and a surprisingly tidy piece of physics.
HIPS + a waist
≈210 calories A 30-minute hooping workout
- Launch it fast
- Sloped hips lift
- A waist holds
- Keep it spinning
For decades nobody could say exactly why a hula hoop climbs instead of falling. In 2024, mathematicians worked it out with small robots. Here is what they found, where the hoop came from, and what studies say about hooping as exercise.
Plain English, with the sources linked.
THE SHORT ANSWER
Spin, slope, curve.
A hoop needs to keep pace with the body,
then the body’s shape does the lifting.
THE WORKOUT
Harder than it looks
Experienced hoopers burned about 7 calories a minute in a 30-minute session in one study.
See the studies
THE HISTORY
An ancient toy, a modern craze
Hoops are ancient, but plastic hoops turned them into a huge craze in the late 1950s.
Read the factsA QUICK SHAPE CHECK
Will the hoop
stay up?
Pick a body shape. The answers come from robot experiments at New York University, published in the Proceedings of the National Academy of Sciences, in which motor-driven 3D-printed bodies twirled small hoops.
The robots were about one-tenth human size, with hoops about 15 cm across. People are not cones or cylinders, but the same forces apply.
GIVE IT A SPIN
Four ideas
from the research.
Launch with your movement
The physics says the hoop must keep pace with the body, which needs a strong enough launch in the same direction that you sway.
Let it ride where you curve
Sloped surfaces lift a hoop and curves hold it. If it keeps sinking, notice where on your body it settles best.
Count it towards your week
The NHS suggests at least 150 minutes of moderate activity, or 75 vigorous, each week. Hooping sessions can be part of that.
Mix it with walking
In the 2019 trial, hooping and walking helped in different ways. Doing both covers more ground than either alone.
TWO STUDIES WORTH KNOWING
Child’s play,
adult workout.
Small studies, but both found
hooping is more than a toy.
≈210 calories
A 30-minute hooping workout
Sixteen women aged 16 to 59, all intermediate or advanced hoopers, burned about 7 calories a minute. Their heart rate averaged 151 beats a minute, about 84% of their age-predicted maximum. The study ran at the University of Wisconsin–La Crosse.
ENERGY · 2011
−3.1 cm vs −0.7 cm
Waist change after six weeks
In a Finnish trial, 55 overweight adults spent six weeks hooping with a 1.5 kg hoop for about 13 minutes a day, and six weeks walking more. Hooping trimmed the waist more; walking did better on blood pressure and “good” HDL cholesterol.
WEIGHTED HOOP · 2019
Neither study was large, and the first used experienced hoopers. Treat the numbers as a guide to what is possible, not a promise.
HOOP FACTS
Five things worth
knowing.
The name comes from a dance
“Hula” comes from the Hawaiian dance, because hooping uses a similar movement of the hips. Hoops themselves have been children’s toys since ancient times.
Plastic made it a craze
Light plastic hoops arrived in the 1950s. After a US launch in 1958, sales were estimated at 100 million in the United States alone within two years.
Twirling is the easy part
In the NYU robot experiments, the exact motion and whether the body’s cross-section was round or oval did not matter: good twirling could be set up “without any special effort”.
Staying up is the hard part
Holding a hoop against gravity needed a sloping surface at the “hips” to push it up at the right angle and a curvy “waist” to keep it there. Cones and cylinders failed.
Walking still has its own wins
In the 2019 trial, walking, but not hooping, lowered systolic blood pressure and raised HDL cholesterol. Hooping reduced waist size and increased trunk muscle mass.
QUICK QUESTIONS
Hoops, answered.
Short answers to the questions people ask most.
Why do some people find hula hooping harder than others?
Body shape plays a part. A 2024 study at New York University found that a hoop needs a sloping surface to push it upwards and a curved waist to hold it in place. Technique matters too: the hoop has to be launched fast enough, in the same direction the body moves.
How many calories does hula hooping burn?
In a 2011 study funded by the American Council on Exercise, 16 experienced hoopers burned about 7 calories a minute, roughly 210 calories in a 30-minute workout, with an average heart rate of 151 beats per minute.
Can a weighted hoop make your waist smaller?
In a 2019 trial with 55 overweight adults, about 13 minutes a day with a 1.5 kg hoop for six weeks reduced waist circumference by 3.1 cm on average, against 0.7 cm after six weeks of extra walking. It was a small, short trial.
Where does the name hula hoop come from?
From the hula, the Hawaiian dance, because hooping uses a similar hip movement. Hoops themselves have been children’s toys since ancient times; the plastic version became a craze in the late 1950s.
Does hula hooping count as exercise?
It can. Experienced hoopers in the 2011 study averaged about 84% of their age-predicted maximum heart rate. The NHS advises adults to aim for at least 150 minutes of moderate activity, or 75 minutes of vigorous activity, a week.
Where the facts come from
Updated
- How does a hula hoop master gravity? Mathematicians prove that shape mattersNew York University via EurekAlert!
- Geometrically modulated contact forces enable hula hoop levitationPNAS, 2024
- Hooping: effective workout or child’s play? (University of Wisconsin–La Crosse)American Council on Exercise, 2011
- Effects of weighted hula-hooping compared to walking (Lahelma et al.)Obesity Facts, 2019
- Hula hoop: history of the toyEncyclopaedia Britannica
- Physical activity guidelines for adults aged 19 to 64NHS