Australian athlete, 27, won two Olympic gold medals in ParisJack served a doping ban after Ligandrol was found in her systemAustralian swimmer Shayna Jack has announced she will retire after the Commonwealth Games in Glasgow.In a video posted on Instagram in which Jack spoke with her coach Dean Boxall, the freestyler fought back tears as she said the Games – from 23 July to 2 August – would be her competitive swan song. Continue reading...