I've started my winter training for the 800/1500 this past week and I'm familiarizing myself with 6:20/mile pace as I'd like that to be my "easy pace." (Shooting for 1:56/4:00) For the past 4 days I've gone out and did 4 miles at this pace. Each time I've felt good and have run my last mile in around 5:40-45, which is more steady-state pace than tempo I suppose. My goal is to run about 8 miles at the 6:20 pace for a normal easy day during the season (Feb-May).
Here is my question: Is there an optimal percentage of my run that should be at "tempo pace" (5:10-5:20)? For instance, when I get to where 8 miles at 6:20 pace is an easy day, maybe once a week I'll do an 8 mile day with the last 25%, or two miles, at 5:15 pace. Is that too much of my run? too little?
Secondly, is the best way to do this kind of progression run to just take off after the first 2/3 or 3/4 of the run, or should I gradually squeeze the trigger down?
Again, I'll probably use these runs like every 3-4 days during my building up period, but would like to keep at least one run a week with this kind of stuff as well. Something like this:
M-Workout assigned by coach
T-Easy day, 8 miles ~50 minutes
W-Workout assigned by coach
T-Easy day, 8 miles ~50 minutes
F-Easy day, 4-6 miles ~30-35 minutes with stride/sharpness stuff
S-Race or workout
S-"progression" run getting down to tempo pace by the end