When I signed up for the Hyrox, a relatively new fitness competition, a few weeks ago, I thought little of it. Running eight times a kilometer sounded feasible, in between lunges (lunges), burpees (stretching jumps) and a few other exercises. I wanted to join because so many people at my gym were talking about it - and it sounded like a cool experience. A race in the Hamburg exhibition halls? Why not.

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