A report found that over half of the high school boys and two-thirds of the girls never shower after sports at school. Researchers suggest students don't want to sweat    take a shower, so they are less active. The researchers questioned almost 4,000 children. Lead researcher Dr Gavin said he was surprised    how rarely students showered. He said children were getting poor health because of less exercise. He said: "   the unwillingness to shower is a barrier（障碍）to playing sport, we need to do something to promote activity at schools."
 , the BBC says the study did not look at the exact reasons    students do not shower. Maybe there are some other reasons. Undressing in front of    may be too much for some children. A spokeswoman for a health organisation said children worry about their body image. She said schools had     role to play in changing attitudes. She said schools should encourage students to do physical activity and let    know they need to shower after.