This is a good-solid approach and often how I do it. I'll incorporate 8 to 12 weeks at time of such training, and by the beginning of a given week I pretty much know what needs to be done. At 52, three harder workouts and three or four recovery days is maxing out.
On the other hand, the runners that I coach want a schedule set out ahead of time.
I've always incorporated periods of the year with more diffuse training. Just running usually six or seven days a week, maybe a tempo effort here and there, some strides, and an occasional race. But my best racing always follows a more focused mix where I know that within a two-three week cycle I'm getting in V02 max (or race pace), threshold, some speed, and longer runs.
I will just cc my reply from that thread here:
I have been doing this for many years now. Once you learn the basics, it becomes ingrained after a while: three or four hard runs each week, the rest is easy running. One of those hard runs should be longer than any other and all of the hard runs should be tailored to the nature of your next goal race. As long as you are not doing too many hard runs in a row and are recovering well, you should be fine. This is not rocket surgery — as laid out in Once a Runner, this is really simple stuff. There are no secrets or shortcuts and what you do in any given day or week or even month is really of little consequence; it is progressing over many months and years that makes the real difference. Consistency is the first key (the next being specificity) and the greatest consistency should become routine in very little time, as routine as anything else that plays an important role in your life.
I still marvel at the paucity of the key workouts I believe people need for the sport, but hey, that's me.
Likewise, though too many seem to have hardly any specific idea of what they are wanting to train other than “get faster” and do off-the-wall workouts that do little more than make them tired.