I do similar things when a task has two physically separate locations like taking out the trash.
While walking out with the trash I will repeat constantly "put in new bag" all the way to the garbage and all the way back, otherwise the task doesn't get completed.
your are connecting two different pieces of data. The speed that a person can run a marathon vs. the ability to run a marathon.
What they are stating is that women are better able to run that distance not that they are faster at running that distance than men.