16x wrote:... your 1/2 marathon time will flourish, but you will be no where close to your max potential in the 800-1500, but you can't have it all can you? maybe you can!
I think you can! Perhaps not an elite runner, who needs to specialize, but a schlep like me can, and did. Last year I ran my 800 PR in mid-August (and PR'd at 1500 right after), and then PR'd at the half marathon in mid-September, without changing the character of my training.
Now I'm quite inexperienced at 800 (I've raced three, all last summer), but depending on which scale you use it's either my best time (according to most scales, at 2:04.8) or my second best time (second to my half marathon time, at 1:14:18 - I forget which scale that was from, either IAAF or Mercier tables).
With the type of training I did last year, the character of which was more or less the same from April to September, I ran a 5k road PR in April, 10k road PR in May, mile and 3000 PRs in June/July, 800 and 1500 PRs in August, and HM in September. All with very little pure speed work. In general, my interval sessions were long intervals.
The only true speed work I ever did last year was maybe 4 or 5 times I ran a light speed session a couple of days before key races. That session was 3 x 200 w/400j @ ~ 800 pace + 3 x 100 W/700j @ ~ 400 pace. That would be the only times all year I ran anything approaching 400-800 pace. I know my times aren't world beaters, but they were good for me, at my age, and I raced consistently at a high level (for me) for a very long race season. With nearly zero effort to "stay in touch with my speed."
So there! :-)