Funny man David Walliams has been telling Newsround about his plans for a new charity challenge that's even harder than swimming the English Channel!
The top children's author, writer and comedian raised more than £1million for Sport Relief by swimming the Channel in 2006!
He said his next challenge would involve swimming more than 100 miles and be in a "much worse environment than swimming in the sea".
Want to know more? Watch the clip to see David fill Hayley in on his idea.
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