Today something clicked during the running session.
The purpose of the first 40 minutes is to run the 2 miles Threshold with "not fresh" legs and after running two miles at 7:03 /mi I was tired and I could feel it when I started the second set of 2 miles Threshold.
Half way through that second set of 2 miles I realized that I had unconsciously reduced my stride length and increased my cadence to increase my running economy so I was running faster while using less energy since I was tired. I run this second set at 7:01 /mi.
Then I purposefully focused on this for the last remaining 1 Threshold mile and run it at 6:54 /mi increasing speed despite the increased load from previous miles.
You can see how the second and third line of high cadence are dominated by purple (higher).
The lesson (at least for me) is to run shorter strides with faster cadence to increase my running economy.
40 min Easy
2 miles Threshold 7:03 /mi
2 min rest
2 miles Threshold 7:01 /mi
2 min rest
1 mile Threshold 6:54 /mi
1 miles Easy
#running #marathon
