I know a lot of people dislike these threads, but I often find the discussion informative. I am hoping to run sub 2:12 in the 800m in exactly two weeks. I'm 38, do not have a background in running from my younger years, and am coming from the endurance side of things.
I did 4 x 400m today in 64.8, 65.7, ?, 66.3 (unfortunately I missed the button on my watch on the third one, but it was at a similar pace; I could feel this, but the watch data also confirms it). There was 400m slow jog rest between the first two in more or less exactly 3 minutes, and 500m slow jog between the others in 3:50 and 4:00 minutes. The first repetition was reasonably comfortable, but the last 200m or so of the others was tough to very tough. After 600m slow jog rest I also did 2 x 2 x 400, with 200m jog rest within and 400m jog rest between the sets, at low 32 in all of them.
As for other sessions, as I say, I'm stronger on the endurance side, and did 4 x 1000m in 3:09 average, last two 3:08, with 400m jog rest, about 10 days ago, followed after 600m jog rest with 300-200-200m in low 48, 31, 31, with 300m jog rest after the 300m and 200m between the 200s.
I don't have much speed, but have been doing some raw speed work (flying 30s and so on), and usually do one or two sprints in the 100-200m range at the end; I can hit, with a rolling start, mid 28s on the 200m, about 13.7s on the 100m, and sub 21s for 150m.
All of this is on the same 200m indoor track on which I'll be racing, in spikes, but solo.
Usually do 50-55km or so per week, all of which is at a solid intensity (my 'easy' runs are at about 4:00 min/km).
I think that if the pacing of the race goes well, I have a decent chance at sub 2:12. Do you agree?