I had never run further than 15, so I decided to run 20. I ended up running 21 due to a navigation error.

This is the map. I ran from Vallejo's Farmers Market back to the BART station in Pleasant Hill:

I finished in 3:30, with a lot of stops to drink water, check my map, and take some sweaty elegant Instagram videos:

A video posted by Caryn (@notcaryn) on