Let's say you got some pretty good college Decathletes (6500-7500 pt guys), but 1500m is weak enough to hurt them in higher level competitions (4:45ish at absolute best).
1500m training is not going to be a point of emphasis, but you have half a practice, once a week, to try to help them improve in the winter/early spring.
Was thinking on a day where they spend first portion of practice on discus or jav technique work, running them through 8-12 controlled 400m reps (grow through season).
I would use the lane eight 400m start and the recovery could be the brief slow walk between finish and start stagger. Probably try to keep the reps around 85seconds.
They get a lot of speed and power work already and in the past they have easy run on weekends and once a week. But I don't think they easy run enough, or with any intent and it just doesn't help them. Figured the above is not that intense and they should be able to handle it. It would help them with lactic tolerance for the 1500m. It they progress could move to a couple 800m or 1k thresholds.