Ex-Olympian Cate Campbell has been covering the World Championship trials in Adelaide. What she's seeing is some great swimming and some athletes at breaking point. Mollie O'Callaghan, Kaylee McKeown, Cam McEvoy, Lani Pallister, have all given voice to the same thing: it's been a struggle post Paris. Why? Ex-Olympian Cate Campbell explains the cocktail that threatens to break our stars. Featured: Cate Campbell, Olympic swimming champion.