The Pete Plan guidance is:
8 x 500m = 3seconds faster than 2k pb pace (2k – 3)
Speed pyramid = 2k pb pace (2k)
4 x 1000m = 1second slower than 2k pb pace (2k + 1)
5 x 1500m = 5k pb pace (5k)
4 x 2000m = Half a second slower than 5k pb pace (5k + 0.5)
3k, 2.5k, 2k = 1second slower than 5k pb pace (5k + 1)
The following guidance is from the WP, talking about 8x500m but applies across the board:
... just gradually get used to the format by doing 8 x 500m with
the first 2 or 3 pieces at some moderate pace, gradually increasing as you go, finishing hard for the last couple.
Calculate your average pace for the workout and next time start maybe half a second above that average and
gradually bring the pace down over the course of the workout. Repeat until the variation between pieces is very
small and you really have to work hard to maintain your pace at the end
"Bring the pace down" means reduce your splits - i.e. get quicker.
Analogy with the weight room is useful, I think. If I wanted to squat 200kg, would I load the bar with 200kg, step back and see how I go? Well, no I wouldn't. I'd need to be mopped up off the floor of the rack. I'd start with something that I can squat and build up a bit, linearly for as long as it worked.
A conservative approach to intervals is likely to be more productive than going balls to the wall first time up and then having nowhere to go.
Of course, I have rarely practised what I preach...
