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VIDEO: The deadliest gym class on earth that needs a professional cardiologist present for each session

Flatline, the hardest and most dangerous gym class in the world, is being launched by Gymbox, at its new site in Farringdon.

 It aims to test all elements of strength and stamina with increasingly difficult tasks over a 45-minute period – the longest time possible for a gym class of this intensity.

Flatline is so hardcore that a professional cardiologist is on site and in attendance for each class in case of emergency medical situations.

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