A woman who suffered a cardiac arrest at the gym was saved by quick-thinking heroes who were working out beside her.

Emily Counter was on the rowing machine at Anytime Fitness in Noosa, Australia, when she had a seizure.

The 21-year-old suddenly slowed, paused and then collapsed onto the ground beside the machine.

Emily Counter was on a rowing machine when she started to feel pain in her chest. Photo / CCTV
Emily Counter was on a rowing machine when she started to feel pain in her chest. Photo / CCTV
As the heart attack started, Emily can be seen slumping off the machine. Photo / CCTV
As the heart attack started, Emily can be seen slumping off the machine. Photo / CCTV
Emily started having a seizure and became unresponsive. Photo / CCTV
Emily started having a seizure and became unresponsive. Photo / CCTV

"I was completely out of it and I don't remember anything," Counter told 7 News.

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Not moving and unresponsive, six gym members suddenly rushed to her aid, with some starting to give the woman CPR.

Gym owner Aaron Petterson and member Ben Duffy ran to get the defibrillator, with Petterson revealing Counter "started to go blue" in the face.

They attached the defibrillator to her and continued to give her vital CPR, managing to start Counter's heart again.

"We got everyone to stand back and we had to press the button and she jumped up just like it was on a movie," Petterson recalled.

The gym's owner and a gym member helped start Emily's heart again. Photo / CCTV
The gym's owner and a gym member helped start Emily's heart again. Photo / CCTV
Emergency services arrived and rushed Emily to hospital where she spent three days in a coma. Photo / CCTV
Emergency services arrived and rushed Emily to hospital where she spent three days in a coma. Photo / CCTV

Counter was rushed to hospital, where she remained in a coma for three days and needed open-heart surgery.

After further tests, Counter was diagnosed with Bland-White-Garland Syndrome (BWGS), a rare form of heart disease which, if untreated, can be fatal.

"I'm one in 300,000. Most don't survive past infancy if they've got this condition," she told 7 News.

After making a remarkable recovery, the Sunshine Coast local told the Courier Mail she initially thought the pain she felt in the gym was just down to her being unfit.

"I was getting heart pain and I was struggling breathing when I was running, way before I had this happen, and I thought I just wasn't fit enough."

More than four months on the young woman can now start exercising again and now wants to get defibrillators in every gym.

She says if it wasn't for the defibrillator in the gym that day she wouldn't be alive.