In the title of this post, "doin' it" is not referring to walking, it's referring to... you know, doin' it.
It's an an interesting mix of theory and speculation put forward by Washington University in St. Louis. After studying a bunch of mammals (161 different species), researchers found that the animals that traveled the most had the most offspring.
I would have guessed that all the walking was done by bigamist mammals who were trying to make sure that their wives stayed far enough apart that they never bumped into each other, but the researchers had a simpler explanation: the animals that walk more find more food. They find more food, it gives them more energy, and so they get busy more often.
Does this translate to the human species? I kind of doubt it. We can drive places to get food. I think that walking as part of an exercise plan to keep up your appearance could lead to more romantic encounters, but I don't think that people would find a direct link in humans between daily distance walked and number of children.
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