A report has just been published by researchers at University College, London, led by Professor Carol Dezateux. It suggests that seven year olds do not do enough exercise and that there are differences between girls and boys in terms of exercise.
You can read the BBC coverage of the research here – BBC report
At this link you can access the media coverage from TV, radio and the print media. It would be useful to you to read these and compare how each source treats the story. How is coverage different? Look at writing style, word choice and use of facts and statistics in each source.
You might also try to find the original report – as a university student it is this primary source that you would want to read, rather then the secondary sources above.