A.M. 10.1 miles. Started with Chauncy, Daniel, Mary Ann and Jeff. Daniel and Chauncy ran 3 then turned around. Mary Ann and Jeff ran the whole 10.1. Did explosive sprints, felt a new sense of smoothness. However, did not feel the same smoothness during the post-VPB pickup. Possibly because of the cold air - it was hard to breathe. Felt it again when sprinting.
Total time - 1:16:06.
Hypothesis - for a distance runner a standing broad jump could be a fairly accurate measure of Quality X. Reasoning behind the madness - he does not have much fast twitch fiber volume, so the contribution of slow-twitch fibers will be significant. Thus broad jump performance will highly correlate to the ability to recruit slow twitch fibers. Which, given enough fuel and oxygen support, directly determines the performances in longer distances including the marathon.
The nice thing about the broad jump vs all out sprint is that it is non-invasive. You can do 5-10 jumps every day with no harm. So anyway, I decided to start testing myself on a broad jump regularly. 80 inches today.
P.M. 1 with Julia in 9:40, 2 with Benjamin in 17:20, Jenny ran 1.5 with us in 13:28.