Paralympic champion Ellie Simmonds is encouraging thousands of people to participate in swimming as part of the Swim Britain event.
Simmonds is taking time out from preparing for the Paralympic World Championships in France to take part in the event.
The swim, which will be held in Coventry at the end of August, aims to get 500,000 more people swimming regularly by 2015.
The event requires a team of four to swim 250m each to complete 1000m. There will be eleven different events across the country.
Simmonds came to national attention when she competed in the 2008 Summer Paralympics in Beijing when she won two gold medals despite being the youngest member of the team at 13.
She won another two gold medals in the London Olympics and set a new World Record in the 400m freestyle.
Simmonds won the 2008 BBC Young Sports Personality of the Year award and has received an MBE and OBE.
Other celebrities that are taking part of the Swim Britain challenge this summer include Rebecca Adlington, Keri-anne Payne, Hannah Miley, Steve Parry, Duncan Goodhew, Mark Foster, Michael Jamieson and they will be joined by David Walliams.
As well as Swim Britain there is a Little Swim Britain. This is for families and children aged between eight and 16, which involves a shortened distance.
You can find everything you need to know about Swim Britain if you click here.
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