It cost Kade Brown $2200 to install a defibrillator, but the cost of not having one would have been much greater.
Last Wednesday, only eight weeks after Mr Brown bought the defibrillator for his gym, a regular collapsed into cardiac arrest.
"I just keep thinking about the repercussions if we didn't have the defib on site," he said.
"There's no doubt in my mind it's paid for itself, you could charge me $100,000 and it would be worth it.
"I think the defib was the difference between life and death - there's no doubt in my mind."
Luckily for the man involved, Mr Brown had recently completed his first aid refresher course through St Johns Ambulance which prompted him to buy the machine for Adrenaline Boxing and Conditioning.
"[Time] doesn't stand still, it feels like you're in fast forward trying to react really quickly," he said.
"In hindsight for me the refresher training... was really front of mind, I knew how I needed to react. It was sort of like I was on autopilot."
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Mr Brown, trainer Stuart Wilcox and another gym regular Paul Morgan leapt into action, assessing the man, calling 000 and setting up the defib.
"It was hectic, like a real life horror movie," Mr Wilcox said.
Mr Brown said the man was not doing strenuous exercise at the time.
He collapsed and eventually stopped responding and breathing. The trio hooked him up the the defib, which administered a shock, before Mr Brown commenced CPR.
"Probably on 25th chest compression he came back," he said.
"From the time he first presented to time back breathing probably about two minutes but it felt like ages.
"He's very close to us, his family is close to us as well so it's funny the things that go through your head all I could think about was his family when I was doing chest compressions."
Mr Brown believes manual compressions would not have been able to bring the man back to life and says he's so grateful they had the defibrillator on hand and training front of mind.
The man involved has been released from hospital in a stable condition.
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