Children at Instituto Geremario Dantas like to play in mixed teams
It's a typical school scene - teams of kids in red, green and yellow vests playing competitive sports.
But there is one striking difference - the sport they are playing at the Geremario Dantas Institute in Rio de Janeiro is one in which teams are made up of boys and girls.
Korfball / Corfebol, invented in the early 20th century, is described as the only true mixed gender ball game.
The rules of the game mean that children in this school sports hall in Brazil are encouraged to play together.
"I really like why you can play with boys and girls," says Giovanni, 11. "It's a sport that allows everyone to play - boys, girls and people with different abilities.
"We are all different and we are good at different things, but in this game we can all play." This week, BBC 100 women are looking for ways to tackle sexism in sport.
From a huge pay gap between men and women in many disciplines, to the smaller female audiences watching TV sports, to girls who drop out of physical education at school - there are many problems when it comes to getting women into sports.
But we are challenging a group of women to find ways to address this issue. Is Brazilian Korfebol one of the answers?
game is similar to netball and basketball
"Korfball breaks the stereotype that boys and girls can not play together and that women are the weaker sex," says Sheila Duarte, a professor at the Geremario Dantas Institute.
"This shows that girls can also play ball games along with boys
John, 12, says he "loves" korfebol. Because? "It's a game that has a lot of movement and you can play with girls," he says.
The game can be played indoors or outdoors on a court and the goal is to throw the ball through the goal, or "korf", a plastic basket on a pole 3.5 m above the ground.
The Netherlands are the dominant team on the world stage, but the game is increasing in popularity all over the world.
Brazilian Korfebol - How to play
Brazil has created several ways to play Korfebol, precisely so that the game adapts to the audience that is practicing. Based on the rules of the Korfball / Corfebol competition created in Holland, this initiative of Professor Marcelo Soares, better known as "Marcelo Korfebol".
Each team consists of four male players and four female players, or even more players, everything will depend on the space being used, the ideal would be 40 x 20 meters.
Physical contact is not allowed in any way, very different from the Korfball / corfebol of the rest of the world that allows the "moderate physical contact"!? which ends up distancing people who do not like the proximity, and who also favors the "stronger", high stature.
The sport has similarities both to netball, handball with basketball. The players score points through pitchers the basket that is called "Korfe"
Of possession of ball, you can only move one foot and can turn in the other. You can not dribble or run with the ball which makes the game cooperative, everyone has to pass and receive, developing the collective of the group.
But while Brazilian korball rules make it perfect for boys and girls, in terms of popularity in schools, much less as a spectator sport, it is still hampered by traditional sports such as football, tennis, cricket and basketball.
These are the sports that attract large audiences, great sponsorship deals and worldwide celebrities.
What is 100 women?
BBC 100 Women names 100 influential and inspiring women around the world every year. By 2017, we are challenging them to tackle four of the biggest problems women face today - glass ceiling, female illiteracy, harassment in public spaces and sexism in sport.
With your help, they will be coming up with real-life solutions and we want you to get involved with their ideas. Find us on Facebook, Instagram and Twitter and use # 100Women
"I can not think of any other industry that has such a salary difference," says Beatrice Frey, manager of sports partnership for UN Women. "Depending on the context of the country and sport, a man can be a billionaire, and a woman [in the same discipline] can not even earn a minimum wage."
Among the 100 highest - performing athletes, there is only one woman - ten of the Wiliams tapeworm.
And while Brazilian koratebol is popular among the children of this Rio school, there are limited opportunities to turn it into a career, even for the best players. Brazilian koratebol has not yet become a successful spectator sport, but it is popular here
"It's only two hours of sport," says Beatriz Vaz, a professional soccer player and member of the 100 women's team that examines the issue of
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Professor Sheila Bandeira responsible for Brazilian Korfebol at the Instituto Geremario Dantas School and personal friend of Professor Marcelo Soares