Running segment minimum length
When creating new running segments, it requires a minimum length of "a few hundred meters"; much shorter segments should be possible (ie running up some of the stair-streets in SF).
There should be a different minimum length for running than cycling. The explanation sounds like it's a one-size-fits-all with cycling: "The intricacies of GPS make short segments (like those that can be completed in less than 60 seconds) hard to time perfectly."
If you can run a few hundred meters in less than 60 seconds, then... wow.