For my 400m runners . . .
On acc/max v days we do something to the effect of 9-15 contacts of High Intensity plyo’s. 3 x 3 hurdle hops or 5 x 3 hurdle hops.
On tempo days, we usually follow it with a low intensity jumps circuit on the grass. Probably around 8-10 exercises with around 20 contacts per exercise. Things like lunge jumps, butt kick jumps, speed skaters, 180’s, etc. It could even be a couple of sets of jumping rope on grass.
On special I, special II or speed endurance days, I lay off the plyo’s for the most part. The track work usually provides enough stimulus for the day.