A lighter training week is not lost training. Reducing volume or intensity can lower accumulated fatigue while preserving continuity, making the next build more productive. The exact timing and size of a recovery week should depend on the training completed and the runner’s response; there is no evidence-based schedule that fits everyone.
When marathon training is going well, a lighter week can feel strangely difficult. The long run is growing, the weekly total is climbing, and then the plan asks you to do less.
That does not mean the training has stalled. Progression is only useful if you can absorb it. Recovery is part of that process, not the opposite of it.
Why reduce the training just when you are building momentum?
Because progression is only one part of training. Your body also needs the opportunity to absorb the work you have already completed.
Why training cannot simply increase every week
Training creates a stimulus by asking your body to do more than it is currently accustomed to. Over time, the body adapts and becomes capable of handling more.
That principle explains why marathon plans progressively increase the demands placed on the runner.
But the progression cannot continue indefinitely. Fatigue also accumulates, and at some point, additional training may stop producing the response you want if there is not enough recovery between periods of increasing load.
Periodization is the way training is organized to manage this process over time.
Instead of treating the preparation as one uninterrupted increase in distance and intensity, the training plan is divided into periods with different objectives and different levels of training load. Several weeks of progressive training may be followed by a lighter period before the next build starts.
Recovery is therefore designed into the training plan rather than added only when something goes wrong.
What happens during a recovery week?
A recovery week does not usually mean doing nothing.
You continue running, but the overall demand is reduced. That may involve lower mileage, a shorter long run, less intensity or some combination of these.
The purpose is to reduce accumulated fatigue while maintaining enough training to preserve continuity.
For a motivated runner, this can feel surprisingly difficult. Training more is tangible. You can count kilometres, complete workouts and see progression in the training log. Recovery can feel as though you are giving some of that progress back.
But a lighter week is not the opposite of training. It is part of the process that allows previous training to become useful.
If you continually add load without allowing enough time to absorb it, the quality of later training can deteriorate. The next build then starts from a position of accumulated fatigue rather than renewed capacity.
Recovery should reflect the training you did
Periodization often looks very neat on paper. Several weeks of progressive training are followed by a lighter week, and then the next build begins.
That planned structure is useful, but real training is rarely as tidy as the calendar.
You may miss sessions because of work or travel. Another period may go exactly to plan but leave you carrying more fatigue than expected. In both cases, what you completed matters as well as what was originally scheduled.
That is why SmartRunning does not rely on planned recovery weeks alone. It also follows your recent training load and how that training is developing. If the signs suggest that the current load is becoming too high, the training can be adjusted and additional recovery or rest introduced rather than simply waiting for the next planned lighter week.
Recovery is therefore both part of the structure of marathon preparation and something that can become more important when the training itself gives a reason.
Training tolerance changes
The amount of training you can handle is not fixed.
As you become fitter and more experienced, workloads that once seemed substantial may become normal. That is one of the objectives of training.
But tolerance can also temporarily decrease. A period away from running, illness, accumulated fatigue or demanding circumstances outside running can all affect how easily the next training block is absorbed.
This is one reason recovery cannot always be prescribed identically for every runner.
You do not need to wait until you are exhausted before recovery becomes appropriate. Well-designed training uses recovery proactively, both through the planned structure of the preparation and by responding when recent training suggests that more recovery is needed.
Think beyond a single week
Marathon training is long enough that the success of the training plan will never depend on squeezing the maximum possible training out of every week.
What matters is the amount of productive training you can accumulate over the whole preparation.
That requires progression, but it also requires enough recovery to keep that progression sustainable.
A recovery week can therefore feel like a temporary step back when viewed in isolation. Seen as part of several months of training, it has a different role: it helps make the next step forward possible.
One important distinction: research strongly supports reducing training load in a taper before competition, but it does not establish one universal mid-block recovery-week schedule for every marathon runner. The timing and size of easier weeks still need to fit the athlete and the training completed.
See how SmartRunning builds recovery into marathon preparation and responds when recent training suggests more is needed.