The schedule that many have posted I am sure is valid if it was sourced from Henrik. However, when my friend trained with them and I asked him about that kind of schedule he had no idea what I was talking about. When he was up there they did no 25x400m sessions or any sessions measured by distance for that matter. Everything he did with them was by time. They would do sessions of 3min, 6min, 8min (I believe), and up to 10min. The most I think anyone has posted beforehand of them doing is 2k-3k reps. So the 10min sessions were surprising to me. The hardest sessions that he did was 4x10min with a very short rest in between.....then he came back in the afternoon for some more threshold.
The reason why everything was based on time I am guessing is because they were not in Norway but away at training camp. He did not mention the time it took to run up these hills as they did not time them either. It was not a very steep hill, it was moderate and about ~200m in length and they just basically booked it up the thing very fast but with some control.
I know they do use lactate meters (you can actually see it on their documentary tv show thats translated on youtube), but when I asked about them using it up there he said "no" and that it surprised him because he had heard so much about it. They mostly used the HR monitor which I personally feel is inaccurate. All of this was interesting to me as many others have stated that they do very highly controlled threshold sessions based on distance, lactate readings, etc. Really none of that occurred at the training camp except a lot of HR monitor use. Then again, this was at training camp and maybe things are more lax there?