Simone Holtznagel and Jono Castano look smitten during the playful

Simone Holtznagel and Jono Castano look smitten during the playful game in the gym

Simone Holtznagel and Jono Castano look smitten as they work up a sweat during a playful game at the gym

Simone Holtznagel and Jono Castano appear stronger than ever during a training session at the Acero gym on Tuesday.

In footage shared on Simone’s Instagram, the pair enjoyed a workout together in the boxing ring.

The couple played a flirtatious fitness game, touching lights on the floor while joking with each other.

Model Simone Holtznagel and celebrity PT Jono Castano (both pictured) looked smitten as they played a fitness game at his Acero gym on Tuesday

Model Simone Holtznagel and celebrity PT Jono Castano (both pictured) looked smitten as they played a fitness game at his Acero gym on Tuesday

Jono wore just a pair of oversized shirtless shorts for the game.

Simone wore skin-tight gym clothes and a long-sleeved track top.

The model later shared the footage to her own account.

She wore her blonde locks in a messy bun.

“It was a draw,” wrote Simone, who was obviously struggling with the game.

Jono wore just a pair of oversized shirtless shorts for the game.  Simone wore skintight sportswear and a tracksuit top

Jono wore just a pair of oversized shirtless shorts for the game. Simone wore skintight sportswear and a tracksuit top

1657026053 132 Simone Holtznagel and Jono Castano look smitten during the playful

“It was a draw,” wrote Simone, who was obviously struggling with the game

Aside from a handful of social media posts, the pair have been surprisingly tight-lipped about their romance.

However, the relationship between the genetically gifted celebrities is developing at full speed.

They confirmed their romance in May when they spotted lips at a Mimi in Coogee.

The pair confirmed their romance in May when they caught lips at a Mimi in Coogee

The pair confirmed their romance in May when they caught lips at a Mimi in Coogee

Mimi’s is a celebrity hotspot owned by Justin Hemmes who is dating Simone’s sister Madeline.

The Australia’s Next Top Model star dubbed the handsome PT “my love” in an Instagram post last month.

It came after Jono split from wife Amy but the couple remain on good terms and still own the Acero gym in Sydney.

The Australia's Next Top Model star then captioned the handsome PT in a post

The Australia’s Next Top Model star then dubbed the handsome PT “my love” in a post.