Developing endurance specific for 100m/200m/400m

[Track_man]

@martijn

If I would have to limit myself to one training distance (not ideal) I’d say on average:
100m for the 100m
200m for the 200m
300-350m for the 400m (cause doing more than 1 rep at 400m at >95% in one training session is impossible for most)

You dont think overdistance works well?