Deload week running: what is it and when to do it

Runners will train through rain, hangover, and questionable shin splints. The one thing a surprising number cannot bring themselves to do is deliberately train less.

Welcome to deload week. Famously harder to execute than your long runs.

What is a deload week in running?

A deload week is a planned, temporary reduction in training load, usually both volume and intensity. It is designed to let your body absorb the work you've already been doing without taking a break from training.

The logic behind it is called supercompensation, and it works like this: training stresses the body, performance temporarily dips, then — given enough recovery — it bounces back slightly higher than before. That small upward step is where fitness actually lives. Not in the hard sessions, but in the recovery after them.

Without that recovery, you're just adding load to a system that hasn't finished with the last round. The fitness eventually stops compounding and just accumulates fatigue, which looks similar from the outside until suddenly it very much doesn't.

Deload vs taper: what's the difference?

They look similar on a training plan in that both involve running less, but they serve different purposes and get conflated constantly.

A deload week sits within an active training block. It's a periodic reset, usually every third or fourth week, after which you go straight back to full training load. The goal is to prevent fatigue from compounding across weeks until it becomes a problem.

A taper is specific to race preparation. It's the structured reduction in the final weeks before a goal race that is long enough to let accumulated fatigue clear, but short enough not to lose meaningful fitness. 

What a deload week actually does to your body

Connective tissue catches up

Your cardiovascular system adapts to training load quickly. Muscles follow at a decent pace. Tendons, ligaments, and connective tissue are considerably less cooperative — they remodel slowly on their own schedule, completely indifferent to your target race date. Collagen synthesis in tendons peaks around 24 hours after exercise and stays elevated for roughly three days.

This is how you can feel genuinely fitter while quietly accumulating tissue stress — and why the overuse injury that follows tends to feel like a surprise. Deload weeks give connective tissue the window to close the gap before what your fitness says you can do and what your tendons say you can do stop being the same number.

Your nervous system gets a reset

Muscles fire through nerves, and the nervous system accumulates fatigue under sustained high load just as muscles do. Neuromuscular fatigue doesn't tend to feel like conventional tiredness. It feels more like your legs are technically present but not fully available: you hit a hill and nothing happens, easy pace costs more effort than it should, sessions that should feel manageable feel like the end of the world.

The first proper session back after a deload usually feels noticeably better than the last few before it. That's the reassuring proof the deload worked.

Hormonal balance gets a chance to restore

Sustained high training without adequate recovery gradually shifts the hormonal environment in the wrong direction. Research on overreaching and overtraining shows that as training stress accumulates without sufficient recovery, the testosterone/cortisol ratio drops — a shift toward a more catabolic state that works against the adaptation you were putting all that work in to produce. In other words: the body becomes less able to build and repair between sessions.

None of these things show up on a training log. That's most of the reason deload weeks feel like doing nothing, even when they're doing quite a lot.

How to structure a running deload week

The most common mistake is cutting volume while keeping intensity — fewer kilometres at the same effort. This is the training equivalent of reducing how often you hit yourself in the face while keeping the force constant. You've done less damage, but the damage you have done is still there.

For most people, both volume and intensity need to come down.

Volume: reduce by around 30–50% compared to the previous week. If you ran 60km, you're looking at 30–40km. The exact number matters less than the principle: this week should feel noticeably easier than a normal week. Not 'slightly reduced' - actually easy.

Intensity: no tempo runs, no intervals, no threshold work. Easy aerobic pace only — the kind where you could hold a conversation without looking medically distressed. If strength training is part of your plan (for most runners, it should be), keep it, but reduce sets and load.

One week is typically sufficient: the benefits of reduced load plateau quickly, and extending a deload without a specific reason risks the kind of detraining you were trying to avoid.

When to deload: scheduled vs reactive

Scheduled deloads are the cleaner option. A common structure is three weeks of progressive load followed by one deload week, then repeat. Longer training plans often build this in; if yours doesn't, it's worth adding it yourself rather than hoping accumulated fatigue resolves on its own.

Reactive deloads happen when your body makes the decision before the plan does. The signals are fairly recognisable if you're willing to pay attention: persistent heavy legs that don't respond to easy running, sleep that doesn't leave you feeling rested, sessions that feel harder than the pace warrants, and motivation has packed its bags.

The reactive deload is psychologically harder to execute because it feels unearned — you're stepping back because something isn't working. In practice, throwing one in when the body is clearly struggling is almost always faster than grinding through and arriving at the same conclusion two weeks later with more fatigue, less time, and a confused physio.

Both volume and intensity need to drop when deloading reactively, too — probably more aggressively than a scheduled one. The body has already made its case and the reasonable response is to listen to it rather than negotiate.

A deload week where you run less, feel better, and come back stronger is not a failed training week. It is the training working.