FelixSprock wrote:
Whilst the talk and idea about doubles certainly has its merit and place in training, for the everyday person it's often not very feasible besides your ever apparent statistical outliers.
Let's draw it back to the reason for NSM: for time crunched folks who have had a difficult time recovering from alternative or traditional training philosophies, leading to stagnation and injury.
As said in the book, doubles should be considered when you max out gains from singles, logistically. The amount of sleep and proper nutrition and LACK of real-life stress it takes to recover from double session days week after week is few and far between for most people. Heck, I find it hard to recover from singles sometimes because of how stressful my life is (I just run REALLY REALLY slow easy miles and taper back intensity or volume on Sub-T days if its needed). But I HAVE found consistency with it - moreso than in the past (running the same times but injured every few weeks).
If you have the luxury of optimal recovery just like the pro runners who do this for a job, be my guest. But doubles just realistically isnt sustainable year in and out for most folks (pro runners even periodize their training to prep their bodies for racing when doing doubles - they TAPER down). Besides HM and marathon specfic tapers, NSMers largely don't do an aggressive taper because the whole point IS long term repeatability.
I think you have got back to the heart of this thread. It is about a method for time pressed, potentially injury prone runners, with a life outside running to get as much "bang for their buck" as possible.
Lately there seems to be a totally different conversation going on, which has merits , but it is not "Modifying the Norwegian approach to lower mileage"
Even Jakob et al only use double threshold for a base phase. It's not a year round thing