17:38 is a lifetime PR for me (sadly), although I would aruge that I was in better shape (but didn't race) in the late summer of 2004, right before I got a stress fracture and was forced to stop running. Gained about 20lbs and lost about half of that over 2 month's time. I still need to lose about 10lbs, which WILL help, but I would still argue that my times should be faster.
I did tempos in the late winter for about 8 weeks. They were usually in the fashion of 10 mile runs. I would run the first 3 miles easy, then go at it for a bit. I have done the following while on these 10 milers after 3 miles easy:
5k in 18:05
6k, coming through the same 5k mark in 17:55!! (not too hard either...this was before I knew my 5k time and had nothing to base it on.)
7k coming through 5k in 18:05
--I was able to extend the tempos pretty well without losing pace in the least.
I live in the south, so getting on the track early is what we do. The tempos were dropped in favor of repeats. Examples:
3 x 2000 in 7:00, 7:00, 6:45 w/ 5 min jog rec.
4 x mile in 5:45, 5:44, 5:41, 5:28 with lap jog (4 min rec)
5 x 1000 all at or right under 3:20
3 x mile at 5:19, 5:21, 5:21 by myself, no help, 4-5 min rec.
12 miler with 7.5 of it at 6:08 pace (not a track workout, but oh well)
600/300 workout in ~1:54/:53
and the 200 workout mentioned earlier
BTW, I ran 5 x {3x200} (only 15, not 20) in :33/:34 with :30 between reps and a lap jog between sets--for the person who asked how fast I could run 20 x 200.
Thanks thus far. I guess I just need to ride out the rest of the track season and incorporate tempos and increase the pace of easy runs after this season (like in the summer)??
Thanks again.