Both men and women are getting slower. Men much faster than women. So: Americans are becoming slower.
The myth tries to be the explanation for the average running time getting slower. It falsily implies that because more women join, people aren't really getting slower. This is false: people are getting slower.
The myth tries to be the explanation for the average running time getting slower. It falsily implies that because more women join, people aren't really getting slower. This is false: people are getting slower.