First, what kind of shape do you want to be in? A basketball player looks very different from a ballerina or a sumo wrestler. If I trained to become an Olympic long-distance runner or swimmer, I’d probably stop menstruating, which would make me less able to accomplish a goal of motherhood.
Once you have set the goal for which shape you want to be, all kinds of factors such as genetics, epigenetics, childhood, diet, exercise, culture, and opportunity come into play.
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