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Young women, especially young women of color, tend to get less exercise than their male counterparts, and the disparities worsen after high school ends.

As teens, 88 percent of boys report being physically active, compared to 78 percent of girls. Once the high school days of soccer games, track practices and physical education classes have ended, around 73 percent of young men stay active, but only 62 percent of women do.

For women of color, this drop in exercise is even more stark. Close to 70 percent of black women say they are physically active in their teens, but only around 45 percent are active when they reach their 20s.


"The bottom line for this study is that there is a lot of room for improving how physically active teens and young adults in our country are," says 

, a coauthor of the study and a professor of pediatrics at Duke University. The study authors analyzed reports of physical activity from 9,472 young people across the U.S. by income, race and sex from 2007 to 2016, drawing data from the National Health and Nutrition Examination Survey.



They found that while most young men are meeting 

 (60 minutes a day for youth or 150 minutes a week for adults), young women aren't. There are several reason why young women are less active than men, says 

, an adolescent medicine specialist at Harvard University, who was not involved in the study.


"I think our society culturally sends different messages to young girls, in terms of their bodies and how they spend their time," Gooding says. A lot of socialization among teen girls is less focused on being physically active when they're with friends or other peers, she says.

In addition to the social barriers that tend to keep many women from working out, income affects a young person's opportunities to be physically active, Wong says.

For example, around 80 percent of young women in the highest income bracket in her study were active even after their high school years, compared with 45 to 55 percent of the women below the poverty line.

Young black women reported the lowest total activity levels among demographic groups, even when they were active in their mid to late 20s.

"We know that there is an unequal distribution of things like athletic fields," Gooding says. "High schools that serve more minority populations are less resourced. I think that's just compounded when people leave the structured school environment."


The physical activity gap could be affecting obesity rates, Wong says. Data from 2013 to 2014 suggested that more than

 2 in 3 adults in the U.S. were considered to be overweight or obese

, and over half of non-Hispanic black women were obese.


"The cultural context in the way that teens and young adults live their lives has changed," says Wong, who counts the increasing use of mobile devices by people of all ages, and the overall reduction in physical activity as cause for concern.

There's a rise in obesity among young adults and teens, she points out. An estimated 21 percent of youth in the 12-19 range are obese, and 9 percent suffer from extreme obesity, according to the National Institutes of Health.

In the hunt for solutions, the best place to help kids develop good habits may be in schools, Wong says.


"Adolescents still in high school oftentimes have more opportunities for physical activity," she says. Wong is working to reach low-income and minority teens in particular with a program of the 

Duke Center for Childhood Obesity Research

 that links a Duke clinic with Durham's city parks and recreation division.


But reaching young adults in their 20s can be trickier, she says.

"The organization of physical activity, whether it's the gym or sports, is much much less [well-developed] for young adults," says Wong.

Sara Kiley Watson is NPR's Science Desk intern. Her Twitter handle is 

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Sara Kiley Watson

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After they lose access to high school sports, young women -- especially young women of color -- generally get less exercise than they should, a study suggests, and far less exercise than young men get.

Black women's exercise rates drop after high school, a study finds.

After high school, young women's exercise rates plunge

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