Celebrity fitness trainer Jono Castano and his wife work up a sweat at the Sydney Opera House

Celebrity fitness trainer Jono Castano and his model wife Amy are spotted working up a sweat on the steps of the Sydney Opera House

He’s the man celebrities go to when they want to achieve a stunning transformation.

And on Sunday, Jono Castano Acero proved to be his own best advertisement as he was spotted working up a sweat in Sydney.

The 29-year-old fitness expert flaunted his chiseled abs as he endured a workout on the stairs of the Sydney Opera House with his model wife, Amy.

Working up a sweat! Celebrity fitness trainer Jono Castano, 29, (left) and his model wife Amy, 30, (right) were spotted working out at the Sydney Opera House on Sunday

The couple were seen running up and down the stairs of the iconic landmark together.

Following their workout, Jono and Amy were seen embracing each other while their adorable puppy, Oli, watched on. 

Jono appeared to be making the most of Sydney’s soaring temperatures and went shirtless for the occasion. 

Fit: The 29-year-old fitness expert flaunted his chiseled abs as he endured a workout on the stairs of the iconic landmark alongside his wife

Fit: The 29-year-old fitness expert flaunted his chiseled abs as he endured a workout on the stairs of the iconic landmark alongside his wife

Looking good! Jono appeared to be making the most of Sydney's soaring temperatures and went shirtless for the workout

Looking good! Jono appeared to be making the most of Sydney’s soaring temperatures and went shirtless for the workout

He completed his look in black shorts and matching sneakers.

Meanwhile, Amy, 30, looked chic in an all-black ensemble which consisted of a crop top, black leggings and sneakers.

She appeared to be wearing minimal makeup and accessorised her look wearing black designer sunglasses. 

Celebrations: Following their workout, Jono and Amy were seen embracing each other while their adorable puppy, Oli, watched on

Celebrations: Following their workout, Jono and Amy were seen embracing each other while their adorable puppy, Oli, watched on

Celebrations: Following their workout, Jono and Amy were seen embracing each other while their adorable puppy, Oli, watched on

Cute! Amy, 30, looked chic in an all-black ensemble which consisted of a crop top, black leggings and sneakers

Cute! Amy, 30, looked chic in an all-black ensemble which consisted of a crop top, black leggings and sneakers

Amy wore her caramel coloured tresses tied up back behind her head.

Jono has a host of A-list clients, including Home and Away star Pia Miller, ex-Bachelor Matty Johnson, PR queen Roxy Jacenko, and actors Lincoln Lewis and Jodi Gordon. 

The social media influencers-turned-celebrities recently celebrated their two-year wedding anniversary.  

Fit: The fitness hunk showed off his impressive gym-honed body and six-pack abs

Fit: The fitness hunk showed off his impressive gym-honed body and six-pack abs

Miracle worker: Jono is famous for being the man behind Rebel Wilson's (right) amazing weight loss, rumoured to be in excess of 20kg (44lbs or 3.1st)

Miracle worker: Jono is famous for being the man behind Rebel Wilson’s (right) amazing weight loss, rumoured to be in excess of 20kg (44lbs or 3.1st)

Last month, Jono paid tribute to his wife, sharing a harbourside photo of the couple.

‘My everything for so many years, it never gets old to say I love you babe. Happy 2 year wedding anniversary ❤️,’ he wrote in the caption.

The pair each shared a loved-up tribute to one another on Instagram, cuddled up together on a yacht in a set of sweet images.  

In love: Jono and Amy recently celebrated their two-year wedding anniversary

In love: Jono and Amy recently celebrated their two-year wedding anniversary