Erin McNaught shows off her pert derrière in a G-string bikini while enjoying a slip ‘n’ slide

SAS Australia’s Erin McNaught shows off her pert derrière in a G-string bikini while enjoying a slip ‘n’ slide

She’s known for her passion for fitness and her unbelievably toned physique.

And on Sunday, Erin McNaught turned up the heat as she flaunted exactly what she’s worked so hard for in the gym.

Taking to her Instagram Stories, the 38-year-old showed off her peachy derriere in a series of videos she uploaded of herself enjoying a slip ‘n’ slide in a G-string bikini.

Uniform change! On Sunday, former SAS contestant Erin McNaught (pictured), 38, flaunted her pert derrière in a G-string bikini while enjoying a slip ‘n’ slide

In the first video, Erin can be seen cheekily looking at the camera before launching herself onto the wet slide.

She is then spotted turning over in hysterics, before being joined by her sons – Evander, five, and Ennio, three – who she shares with British musician Example.

The mother-of-two then gives the slip ‘n’ slide another go, but this time while holding the camera toward her face.

She can be seen smiling as she travels down the slide and water splashes back on her face. 

Slippery when wet! Taking to her Instagram Stories, Erin showed off her peachy derriere in a series of videos she uploaded

Slippery when wet! Taking to her Instagram Stories, Erin showed off her peachy derriere in a series of videos she uploaded

Oh no! In the first video, Erin can be seen cheekily looking at the camera before launching herself onto the wet slide

Oh no! In the first video, Erin can be seen cheekily looking at the camera before launching herself onto the wet slide

Whoops! She is then spotted turning over in hysterics, before being joined by her sons - Evander, five, and Ennio, three - who she shares with British musician Example

Whoops! She is then spotted turning over in hysterics, before being joined by her sons – Evander, five, and Ennio, three – who she shares with British musician Example

To celebrate the occasion, Erin then ate pizza and shared the result of her tiresome day with her followers.

‘Post-gig pizza and pool party,’ she captioned her video, where she chowed down a slice of pepperoni pizza. 

Earlier this month Erin was slammed for promoting a soft drink label on her Instagram.

Giving it her all! The mother-of-two then gives the slip 'n' slide another go, but this time while holding the camera toward her face

Giving it her all! The mother-of-two then gives the slip ‘n’ slide another go, but this time while holding the camera toward her face

Yum! To celebrate the occasion, Erin then ate pizza and shared the result of her tiresome day with her followers

Yum! To celebrate the occasion, Erin then ate pizza and shared the result of her tiresome day with her followers

The former SAS Australia contestant posted a photo of herself hanging on climbing frame while clutching a can of Pepsi Max. 

‘The few weeks I was on SAS were a MASSIVE challenge,’ she began her sponsored post. 

‘So when @PepsiMaxAus asked me to get involved in their Taste Challenge, I thought I’d take on the test by trying out some of my new tricks in the gym, but with a bit of a twist!’ she continued. 

Wrong choice of beverage? Erin's post follows being slammed by followers earlier this month for promoting a soft drink label on her Instagram

Wrong choice of beverage? Erin’s post follows being slammed by followers earlier this month for promoting a soft drink label on her Instagram

Describing her gravity-defying photo, Erin wrote: ‘Monkey bars + hanging sit ups + while taking a sip of two different colas.’ 

It was not long before some followers accused Erin of ‘selling out’ by promoting an unhealthy beverage rather than a product that reflects her healthy lifestyle.

‘After all your exposure to a wide audience you had a chance to promote a healthy choice of beverage! You can influence for the better, girl! I can’t believe you could get behind damn Pepsi,’ one follower wrote in the comment section of her post. 

Not happy: 'I can't believe you could get behind damn Pepsi,' one follower wrote in the comment section of her post

Not happy: ‘I can’t believe you could get behind damn Pepsi,’ one follower wrote in the comment section of her post