Today I rode my bike over to Mead High School and ran barefoot on the track. That lasted about two laps. It felt worse than asphalt so I moved to the grass just inside lane 1. Nice--the laps are faster there. My lower calf muscles are strong enough now to allow me to land on my forefoot but I have noticed the left calf is not as strong as the right and it starts backsliding a bit and landing more flatfooted. But it's still early on. I am concerned about the development of my callouses. They're not getting thicker and I wonder if the abrasive asphalt and cement are sanding them down. I figure I'll give them a rest while I'm attending training in Nashville this week and see if they improve.