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Juliette Stebbings, Senior Lecturer in Sport, Exercise and Health Psychology, University of Portsmouth

75 Hard: what you need to know before taking on this viral fitness challenge

The challenge's rules are very strict. El Nariz/ Shutterstock

Every week there seems to be a new fitness challenge trending online. But one that’s managed to remain popular over the last couple of years is the 75 Hard Challenge. On TikTok alone, the hashtag #75Hard has more than 1.2 billion views.

It’s easy to see why this particular challenge has remained so popular, with video after video of people showing off their staggering body transformations – which they claim are the result of the challenge.

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