I had never heard of the term “Athena runner” until Anne Milligan mentioned it a few months ago, and I thought it was a neat concept, given the connection between bodyweight and running speed (i.e., roughly speaking, every extra pound of weight makes you 2 seconds/mile slower). Here’s a race that took the idea one step further. Called the Las Vegas Fat Boy 5K, it described itself this way: This is an event for “the…