I think this is some sort of Dutch altitude training centre when you get to the top and you need oxygen. When you get back down again you need a knee replacement....
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@kim_harding Are the Dutch desperate for a little topography? (asking as someone who lives in Colorado, but knowing that this interferes with my use of my Dutch style bicycle).
@Gaythia There was a plan from a Dutch cycle racer to build an artificial mountain in the NL to provide a training ground, but it didn't get off the ground
@Gaythia Not all of the Netherlands is completely flat and in the hillier bits, people cycle just as much, with the same sort of bikes. Of course, the problem with flats is there is no shelter from the wind. A day of relentless headwinds can get very wearing 😉