Rob Heffernan: Taking one step at a time as he prepares for Dancing with the Stars

An Olympic athlete, Rob Heffernan is well used to gruelling training sessions. Nothing though, prepared him for rehearsals for Dancing with the Stars, he tells Esther McCarthy.            

Race walker, Rob Heffernan, has found a way through pain, discomfort, and mental barriers to win an Olympic medal. But cramp from hours of tangos and foxtrots is another kind of pain.

After eight hours of busting his moves for his forthcoming stint on Dancing With the Stars, even the super-fit Heffernan felt the effort in his legs.