How to explain extreme human dimorphism?

Is there any way to explain how did humans in my planet end up with extreme dimorphism without resorting to polygyny nor "magic"?

I want men to be around 6ft (183cm) - 230 lb (105kg), while women should be around 5ft 10in (178cm) - 112 lbs (52kg). The planet is similar to earth and was colonized several generations ago. In short I want both of them t be quite tall, but men to be built for strength, while women should be very agile.

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How to explain extreme human dimorphism?

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