Happy family! Jono Castano and ex Simone Holtznagel put on a united front for their baby daughter Gia as he stages a workout session for the model

Simone Holtznagel and Jono Castano have proved they can still be a happy family for their daughter Gia.

The model, 31, and personal trainer, 33, split in May last year, around nine weeks after welcoming Gia into the world on Easter Sunday.

Despite the couple's acrimonious break up, they reunited this week for a family workout session at Jono's Acero gym.

Both Simone and Jono shared a series of clips to their Instagram stories on Saturday that showed the pair enjoying a morning workout.

One clip showed Simone  working on her core with her elbows perched on a large gym ball.

Jono, meanwhile stood behind his ex offering encouragement as Gia sat perched on the personal trainer's chest in a wearable baby carrier.

Captioning the clip, the pair suggested that it represented the start of a bright future for Gia in the fitness industry.

'Gia's first client,' they joked.

Another clip showed baby Gia watching on as a gym pal of Jono's worked up a sweat on an exercise bike.

A third video showed Jono in doting dad mode, playfully bouncing his daughter in the baby carrier. 

In July, 2024, Jono confirmed news of their break-up to Daily Mail Australia and Simone has since said she is raising Gia alone.

She also recently made a cryptic remark that she 'couldn't change' the man she loved.

'I wanted to set an example for my daughter; that's something that shifted for me, Simone revealed to Stellar.

'One day I was like, "What am I doing? This isn't right."

'And I would hate if she was ever in this situation.'

She continued: 'You have to do what is right for you at the end of the day.

'No matter the number of promises or anything else that people make, when they show you who they are, believe them.

Because you can't change people.'

Simone also said she is content co-parenting Gia with Jono and that she is confident she made the right choice.

'I've never felt more sure of anything, and I know I can do it by myself,' she admitted.

'It's unfortunate that I'm mostly having to do it by myself, but I couldn't think of it any other way, really,' she said.

'What I'm doing just feels very right for me, the most important thing to me is that Gia is happy and healthy, and that I'm happy too.'

The couple first started dating back in 2022, months after Jono confirmed his split from his longtime partner Amy.

Celebrity personal trainers Jono and Amy were high school sweethearts, but divorced in 2021 after 15 years together.

Simone confirmed she and Jono were expecting their first child together in October last year, and welcomed Gia into the world on Easter Sunday, March 31.

As Simone remains single, Jono has since moved on with fashion designer Nilofar Khirzad.