One week until official training starts

Why is it that the day after a long run I always have some of my best runs? Today I decided to do a tempo run and thought I'd do a 45 to 50 minute one.  Five minutes into my run I knew this was going to be a good day so I ended up doing a 60 minute tempo run, peaking at 7:40 pace for five minutes and holding 7:47 pace for another 10.  And at the end of 60 minutes, I felt great and probably could have kept going for another couple of miles. 

It's always like that the day after a "long run" (not that yesterday's 10 was that long).  I always am able to do great tempo or interval workouts the day after. Does it work different muscles? Are my lungs in peak form or something after an endurance run? I'm not sure what it is, but I think I'm going to continue to take advantage of the stamina boost I always feel after my long runs and try to do my tempo runs and interval training (but maybe not the hill repeats) the day after long runs. I know Hal Higdon's plan calls for those on Tuesdays and Thursdays but I think it makes sense to do them on days that are easier for me. I don't know, maybe my logic is completely flawed here, but I think as long as I'm doing those workouts, it fundamentally doesn't matter what day I do them on, right?

Training for LB starts next Monday officially. I'm a little nervous because this is for real - the training that supposedly gets me up to Boston level. I think I can do it, I just need to be disciplined.

Time to bust out the new shoes and lay my old shoes to rest. My shins will thank me.

Today's run: 60 minute tempo run, 7.45 miles. Also finally did some ab work, triceps, and back.