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A GYM bunny was propositioned by a hunky personal trainer in a sting set up by her boyfriend to find out if she would be unfaithful to him.

The jaw-dropping scenes, which were filmed on a hidden camera, have been uploaded to YouTube channel, , who regularly orchestrate honey-traps to fool philandering other halves.

 The personal trainer helps the woman stretch her legs - as her boyfriend watches the intimate scenes on a hidden camera
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The personal trainer helps the woman stretch her legs - as her boyfriend watches the intimate scenes on a hidden cameraCredit: How to catch a cheater

The film begins with the woman, who is not identified but is believed to be from America, lifting weights.

A fitness instructor, who is played by an actor, comes over and offers to give her some advice.

“I’m actually a personal trainer at this gym, do you mind if I give you a few pointers?” he says.

“Yeah, go ahead,” she replies.

 The trainer leans into her during the steamy 18 minute session
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The trainer leans into her during the steamy 18 minute sessionCredit: How to catch a cheater
 The pair get extremely close - much to the annoyance of her partner
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The pair get extremely close - much to the annoyance of her partnerCredit: How to catch a cheater

Unbeknown to her, her boyfriend Peter is watching the pair’s exchange via a candid camera.

The trainer shows her how to lift the barbell before standing extremely close to her as she does it.

He then tells her to “spread your legs a bit”.

The trainer then takes her to a private yoga room to “show her a few workouts”.

She lies on her back on the mat while he holds her leg in the air and leans into her body.

 The actor finishes their session by hitting her bum and then asks for her number
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The actor finishes their session by hitting her bum and then asks for her numberCredit: How to catch a cheater

By this point, Peter is getting quite flustered.

“Oh yeah, just stretching! They’re having sex with their clothes on!” he yells.

The pair enjoy a steamy 18 minute session.

It ends with the trainer massaging her legs and then spanking her bum.

“We should hook up some time,” he flirts.

The girl tells him she has a boyfriend but they still exchange numbers and hug goodbye.

Peter is extremely emotional but he can’t decide if what he has just witnessed classes as cheating.

“I don’t wanna see somebody else stretching her out,” he moans.

“He touched her. They’re basically having sex!”

Peter admits at the end of experiment that he actually wants to catch his girlfriend cheating, so he has a good reason to break up with her.

 The trainer massages her bottom and the tops of her thighs
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The trainer massages her bottom and the tops of her thighsCredit: How to catch a cheater

The pair have been dating since school, she is his first and only girlfriend, but he wants to dates other women.

The video was uploaded in January and has since racked up over 1.2 million views.

“This guy still asks if that’s cheating when they’re low-key grinding,” commented one social media user.

While another added: “Dude, let me help you… YES she was cheating. DUH!”

But this isn’t the first sting to sweep the web.

Earlier this week we reported on a plumber being propositioned by a “horny” lingerie-clad actress as his girlfriend watches on a hidden camera.

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