For all out maximum strength intervals, I walk the rest interval, and increase it to 1:1 work:rest. For everything else, it's usually an easy jog during the rest interval (or for hill repeats, jog downhill), and the rest is about half of the interval period. You might have to increase your stamina a bit before you can manage a jog, or do your intervals a little slower to the point you can jog inbetween. You'll still benefit from them.
The longer the interval, the fewer I do. For something that lasts 4-5+ minutes, I only do 4-5 of them. For something that lasts 1-2 minutes (and hills), I will do 6-8 of them. And for all-out intervals of 30-60 seconds, I will probably still only do 6-8 of them (but walk inbetween), maybe sometimes 10-12.
One good one that I like is the step counting - do 100 steps, 50 easy (or walk), do 200 steps/100 easy, 300 steps/150 easy, 400 steps/200 easy, start over at 100, repeat to the 45 minute mark (or whatever minute mark is relative to your level of difficulty, maybe only do 30 minutes). That way it's relative to your pace, there's variety, and it's time-based.
For something like mile repeats or several minute efforts, it's about the hardest reasonable amount of effort I can do and still feel like I am sustaining my form (about a 5k pace, I guess). For those 1-2 minute efforts, it's somewhere harder than that (+5-10 beats). For all out efforts, it's all about moving fast (+5-10 beats of that or +10-20 from sustainable max effort).
Somewhere I was reading an article that referenced this calculator for speeds, though I use feel/HR more than speed it was nice to see a relative guide: http://www.runbayou.com/jackd.htm
YMMV, of course... I imagine we'll all have some input for this one!![]()



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15 miles. 15 miles. I have to keep saying it to comprehend that I'm actually planning to run 15 miles. 15 miles. 15 miles. 15 miles.
Six easy tomorrow and then a quick jog friday after my drive! Race saturday!

