I have found that tempo runs have greatly benefitted my own training, and I would love to successfully implement it with my high school runners.
Do any of you have success incorporating tempo/threshold runs at the high school level? (By "tempo" I am thinking of Daniels' definition: 20ish minutes at a pace 25-30 seconds slower than 5k race pace.)
I find that only my top varsity runners can successfully execute something like this (boys at low 16s/girls at low 19s for 5k PR). Other runners, even my second tier varsity, have trouble maintaining a sustained effort of this type. They either go too slow or too fast (and of course slow way down by the end). I coach 40-50 runners; I don't have the resources to differentiate workouts too much, and I simply have a hard time justifying a workout that only benefits about 10% of my runners.
Fartleks seem to be a better fit -- is that what some of you find? For example, the whole team did 8 x 2 min hard (with 1 min easy) yesterday. Everyone could handle "pushing" for 2 minutes (granted, the slowest wasn't much of a difference between hard/easy, but they still showed some effort on the hard part). We also do "landmark" fartleks on our home course too -- all runners can wrap their head around that one.
So, any of you out there with similar stories or advice about fartleks vs tempos for the high school cross country runner? Any constructive response would be much appreciated. Thanks!