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Describing something as ‘tough’ is pretty subjective. One student’s ‘tough’ exam could be another’s walk in the park, and one man’s ‘tough’ guy might be someone else’s teddy bear. Despite this, some London fitness fans have become obsessed with bragging that – out of all the hundreds of gyms and torturous classes in the city – they do the toughest one of all. But how can you tell which workout is the real, brutal deal? A serious, analytical study? Maybe. Complicated, stat-based science? Potentially. My approch is to don a Fitbit and a fetching pair of bright red shorts and, over the course of four days, do the four classes that are widely accepted as London’s hardest, back to back.
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