Asked by Burnett what she plans to do next , Johnson said she will take a year off and then hopefully start college . Johnson won 20 Olympic medals and a season of `` Dancing with the Stars '' She is retiring at four because of recurring knee problems . `` It was definitely one of the hardest decisions I 've ever made , '' Shawn Johnson says .
Johnson won 20 Olympic medals and a season of `` Dancing with the Stars '' She is retiring at four because of recurring knee problems . `` It was definitely one of the hardest decisions I 've ever made , '' Shawn Johnson says .