Sharing a before-and-after photo series on Friday, the blonde beauty wrote in the caption: 'Just when I started to tell myself that I didn't want to get up for F45 at am today, partly because it's raining, partly because I'm not the fittest one there, partly because I have irrational fear about group exercise.'She went on: 'After all I'm just a former chubby girl who awkwardly loved leopard - but what I've learnt so far is that life's too short not to keep growing, keep pushing, keep fighting your fears, keep loving yourself & having fun.'Best known for his roles on Neighbours and Dancing With The Stars, Daniel has been motivating his younger sister to stay on track and keep up with her gruelling exercise regimen since she began the incredible body blitz over two years ago.