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He's the go-to personal trainer for dozens of celebrities in Australia who want to maintain their sizzling physiques.
And on Sunday, Jono Castano flaunted his own chiseled body on Instagram, as he put on an eye-popping display while wearing a pair of tight briefs in the gym.
The 30-year-old showed off his impressive washboard abs and bulky thighs in the post, which he captioned 'Mood'.
'That looks heavy!' Celebrity trainer Jono Castano, 30, (pictured) left little to the imagination as he flaunted his bulging muscles while wearing very tight briefs in a new mirror selfie
The fitness guru stuck his tongue out for the cheeky snap, while putting his middle finger up to the camera.
The sizzling locker-room selfie sent his 679k followers into a frenzy, with one writing: 'Bulging all over obviously,' while a second added: 'That looks heavy.'
Others appeared to have played closer attention to the image, noticing that Castano may have been wearing his boxers on backwards.
