Posting to his Instagram Stories on Monday, Chad, shared footage of the 21-year-old sweating it out.
In the video, the blonde bombshell is seen parkside, working her hamstrings as she squats with an exercise band around her thighs.
‘Look at the muscle spasms,’ she proudly said in between her reps.
‘The workout’s getting to her,’ Chad, 28, added.
In another video, Tilly is spotted working her abs with crunches.
Following his winning stint on Big Brother, Chad took home the $234,000 prize pool.
Before appearing on the Channel Seven show, he ran his own personal training company based in Sydney’s Bondi Beach area.
He has since worked for a Sydney-based gym named ACERO, alongside Rebel Wilson’s trainer Jono Castano.