The most I've ever seen recommended is 10 repeats. 20? What planet is that?
Ok, 10 then
I didn't look it up, and I haven't been doing them. See my logic below.
I use Yassos (10x800m, starting every 5 minutes) as a technique & VO2max workout about a week and a half out from a goal marathon. It is one of about a half dozen calibration elements I have for determining a realistic goal pace: in my case, my optimum marathon time is about 5 minutes higher than what the Yassos predict, provided the workout feels hard but not brutal. The catch for me is that I kind of have to estimate the 800m pace first and then confirm that it feels like it should, rather than racing each interval.
Ian, I'm surpirzed that the Yasso's work for you with only 10 repeats. Here's my logic, and its a sample size of 1. My old running book by Jeff Galloway uses 1 mile repeats (intervals or whatever we call them). His program alternates the long run and these repeats on the Sundays after the hill strength building phase. After the hills the long run is about 16 miles (by memory) and goes up by 2 miles every other week. The off weeks are the intervals starting at 2 x 1 mile and building to 10 (I think) towards the end.
For me my Oct 2008 marathon race was 3:36 xx and my 2009 MP target was 3:35 (which gives a Yasso at 3:35 or about 7:10 per mile pace). This past summer I was doing the 1 mile repeats at the 7:00-7:10 pace on the track at a very even pace per lap. So I was hitting the 800 at 3:30 on the way to the 7:10.
To me the Yasso figures are a bit to conservative for "only" 10 repeats. Now I know that my own experience in the marathon this year was lack of endurance. I'm pretty sure that I could run Yasso's at about 3:20 if I had a full 5 minute recovery. I was doing the 1 mile recovery at about 4 minutes which is my walk time for 1 lap of the track.
In the early 90's I followed the program to to the T with both the long runs and was doing my 1 mile repeats at about 6:40 mile pace and I had marathon debut at 3:10.
If I read Michael's post correctly I think he is suggesting 1200 meters for 7 min miles and maybe longer distances if the pace can be faster. Did I get that right?
Would there be any benefit to do doing a ladder of 800's 1200 and 1 mile? And if so would the workout be
a) x numberof 800, 1200, 1600 or
b) x number of 1600, 1200 800 or
c) x number of 800, 1200, 1600, 1200, 800?
Dave
'10 ATB 2:27, Boston 3:43, Missga 3:42, Sulphur Spring 25k, Niagara 50, ITT,Toad 50, Marine Corp M,
09 Chilly 1:43; ATB 2:37, Boston 3:50, Missuga Mara 3:49, Run for Toad 25k 2:22, Oakville half 1:51, Detroit 3:45
'08 Chilly 1:42; ATB 2:31; Miss Mara 3:43, Westover, Erie (DNF), Detroit 3:36
'07 Chilly 1:45, Detroit 3:50
'92-93 Half 1:27; Detroit 3:10, Boston 3:56