Double Olympic champion Dame Kelly Holmes has been named as the first national "school sport champion" in a drive to boost PE in schools.
Dame Kelly hopes to inspire future champions
The athlete said winning the bid to stage the 2012 Olympics had given British sport a great boost which could inspire sports stars of the future.
She will visit schools and sports events to promote the government's strategy on school sport.
Dame Kelly said she wanted to help discover fresh sporting talent.
The 800m and 1500m champion at the 2004 Olympics said she was proud and delighted to be given the role.
"I believe I can help to encourage young people to get more involved and also make this a greater priority for everyone," she said.
"I want to see real change and for more children to take part in more activities.
"We need to be a sporting nation and for that to happen we have to inspire, motivate, encourage and capture the imagination of all our young people so that sport becomes a part of their day-to-day lives."
Tessa Jowell, Olympics minister and Secretary of State for Culture, Media and Sport, said Dame Kelly's involvement would be "a real boost" for school games.
"She will no doubt show today's and tomorrow's young people why sport does matter - and how it can change your life for the better," she said.
Dame Kelly said she would try to find out why some pupils were not keen on sport. She said if she found some were put off by their PE kit, for example, she would pass this message on to the government and schools to see what could be done.