Interesting thread. Since it was started by a masters guy, let's make sure it doesn't deteriorate into sniping and argument, eh? I like this quote here:
Doug E. wrote:"There's more than one way to San Jose".
Many roads to Rome. DRF can get you there. Rubio can get you there. SoCalPete can get you there. I think it's a question of picking one of the better approaches and sticking with that and see if it works for you. Don't try to mix and match - a little bit of Daniels, a dash of Rubio, a peck of Pete Magill...
I agree with what the faster Pete posted - mostly.... I think there's a time and a place for short recoveries, and a time and a place for longer recoveries. In part, this can depend (IMHO) on what kind of runner you are. If you're blessed with natural speed and a good finishing kick, you probably need to keep the workouts more aerobic with shorter recoveries (and the pace to accommodate the shorter recovery). If you're a strength runner, with no kick, you can probably get away with trying the same workout a little harder with longer recoveries. Also, a strength runner would need to spend some more time working on basic speed, with stuff like 6 x 100-150 "all out" with 250 jog (as an example).
The original question that was posed was this:
"I am 42 years old. I have run the mile in 4:53. My speed work consists of alot of qtr's at around 72 - 75 seconds (8 - 10 repeats w/ qtr mile recovery jogs). I would like to try a 6 x 600 meter workout. What kind of times should I be running?"
So he was only asking about pace for a set of 600s, not a general critique of his training approach. I'm in the middle of 800/1500 training for indoors, and over the past couple of months I've done 600s at a couple of different efforts:
8 x 600 w/2:00j (~ 250m) ~2s/lap faster than 3k pace
5 x 600 w/5:00j (~ 800m) ~2s/lap faster than 1500 pace
The first session was quite challenging but not too much. The second session was a little too much for me the day I tried it and I changed it to 2 x 600 w/5:00j + 3 x 400 w/3:30j. The revised session was again challenging, but not too much.
Now I imagine some people might want to jump in and say these sessions are too hard. They probably would be too hard for someone who doesn't spend a lot of time working on aerobic fitness, and logging a decent amount of easy mileage.
A random smattering of other sessions I've done in the past couple of months and in track training last summer include:
6 x 400 w/5:00j @ ~3s faster than 1500 pace
2 x 5k @ ~ HM pace
2 x (5 x 200) w/3:00/10:00j @ ~ 400 pace
2 x (3 x 800) w/2:00/3:00j @ ~ 2s faster than 3k pace
4 x 2000 w/1:45j @ ~ 10k pace
8 x 1200 w/75s j @ ~ 10k pace
10 x 300 w/3:00j @ ~ 1000 pace
3 x (3 x 300) w/60s/5:00j @ ~ 800 pace
2 x 4000 w/2:00j @ ~ 2s/lap slower than HM pace
5k of 200/200 fartlek (~ 5k pace/~ 5k pace + 15-20s/200)
3 x 200 w/400j @ between 400-800 pace + 3 x 100 w/700j @ faster than 400 pace
Plus lots and lots of strong aerobic running (easy runs with ~ 3 miles @ M + 15s/mile), and "lots" (for me) of regular easy running at M+75-90s/mile or slower.
DISCLAIMER: just like the fast Pete said, none of this is a training program, and I would never suggest these sessions would all be useful for anybody. These are just some sessions I have done in track training (I don't specialize at any distance - this indoor season I will have raced 800, 1500, 3000 and 5000), all the while improving (and I'm 42.5).