Easy 8 miles with Ted in the morning. Both of us were sleepy. Tried to start chasing the 7:30 guy at 4 miles, but did not gain much on him because we were too sleepy and chatty at the same time - how is that possible? Finally, at 6 miles got serious. Caught him, then went after the 7:25 guy, got him too. 59:11 for 8 miles. HR was normal, even too low perhaps. Stayed under 120 until the chase began, maxed at 140 during the chase going about 6:15.
Ran with the kids in the afternoon. Put on ankle weights while pushing Jenny in the single stroller. First ran 0.5 with Benjamin in 3:45. Then another 0.5, and of course this time around I had to beat Benjamin's time, and every one of his splits. Ran 3:32.
Went to see Dr. Jex. My neck has made some progress - the curvature angle increased from 16 degrees to 23 ( ideal 45), while the head tilt decreased from 18 mm to 8 mm (ideal 0). However, according to Dr. Jex, the changes in the lower spine do not start happening until the neck curvature angle is at least 27 degrees. And, according to my expectations, there will be no signficant improvements in running until the lower spine starts to re-shape. So there is quite a bit more work left to do before I can say anything about the effectiveness of the Pettibon system in improving running speed and economy.
If anybody reading this is or knows a graduate or PHD exercise physiology student that needs a research topic, here is something I would really like to seriously get researched. The relationship between the shape of the spine, the maximum running speed, and the running economy in aerobically well-developed distance runners with the dominance of slow-twitch fiber types. My hypothesis is that given the same fast-slow twitch ratio, running economy, top speed, and the spinal shape will correlate to a high degree.