The summer holidays are a good time for children to get out, about and active. But across Wales only 46% of girls are taking part in regular physical activity.
Sport Wales says it's a 'national crisis' and wants more girls to be encouraged and made to feel comfortable.
I've been to visit the 'Us Girls' sports day camp in Swansea, where they encourage girls of all abilities to try new activities.
- Watch the video below: