How to taper properly (and why it feels so wrong)

An empty athletics track at sunrise, lanes marked and nobody running

Most people get the taper roughly right by accident and then spend two weeks quietly undermining it.

They cut the volume, which is correct. Then they also cut the intensity, because everything feels hard and backing off seems sensible. Then they add a session back in on the Thursday, because the legs feel heavy and that must mean they’re losing fitness. By race day they’ve done a worse version of all three things.

The research on this is unusually clear, which is rare enough in sports science to be worth paying attention to.

The shape the evidence keeps landing on

The most useful single piece of work here is a meta-analysis by Bosquet and colleagues, published in Medicine & Science in Sports & Exercise in 2007. They screened 182 studies, included the 27 that met criteria, and looked at what actually changed performance.

Three findings, and they’re all about what you change and what you leave alone.

Cut volume by 41–60%. This was the single largest effect in the analysis. Not a token reduction — close to half your training load, and ideally reduced progressively rather than dropped in one step.

Don’t touch the intensity. Keep doing the paces you’ve been doing. The analysis found a positive effect for maintaining intensity, not reducing it.

Don’t touch the frequency either. Keep running the same number of days. The sessions get shorter, not rarer.

Two weeks is the sweet spot. A two-week taper produced the strongest overall effect.

A separate review by Mujika and Padilla puts a number on what that’s worth: performance improves by about 3% on average, with a usual range of 0.5% to 6%. On a four-hour marathon, 3% is around seven minutes. That’s a bigger gain than almost anything else available to you in the last fortnight.

Where the evidence disagrees with itself

Worth being straight about this, because most taper articles present a consensus that doesn’t quite exist.

Bosquet’s meta-analysis says cut volume by 41–60% and leave frequency alone. Mujika and Padilla’s review — overlapping authorship, same era — says volume can come down by as much as 60–90%, and that frequency can drop slightly, by no more than 20%.

Those aren’t the same recommendation. The honest reading is that the direction is settled and the dose isn’t: volume down a lot, intensity untouched, frequency roughly unchanged. Within that, there’s a range, and where you sit in it depends on how much training you were doing and how beaten up you are when the taper starts.

Mujika and Padilla also found the taper can run anywhere from four days to more than four weeks, and that progressive, non-linear reductions beat step reductions. Easing down works better than falling off a cliff.

Why it feels like you’re losing fitness

This is the part that wrecks more tapers than any training error.

Around day four or five, most people feel worse, not better. Heavy legs, poor sleep, irritability, phantom niggles, a creeping certainty that they’ve lost everything. There’s a name for it in running circles — taper tantrums — and it’s common enough to be unremarkable.

Two things are happening.

The volume you’ve removed was masking the fatigue, not causing it. You’ve been training through accumulated tiredness for months. Take the training away and the fatigue becomes the loudest thing in the room.

Your body reads freshness as untrained. You’ve spent a block associating effort with progress. The absence of effort registers as the absence of progress, which it isn’t.

The physiological review by Mujika and colleagues catalogues what’s actually going on underneath: muscle glycogen rises progressively, creatine kinase falls (a marker of recovery from muscle damage), strength and power increase measurably, and mood disturbance drops. None of that is perceptible from the inside. You feel flat; you’re getting faster.

The niggles that appear from nowhere

This one catches people out, and it’s worth understanding rather than panicking about.

Niggles frequently surface during a taper that weren’t there during hard training. Partly that’s attention — you have more time and less distraction. Partly it’s that reduced training load changes what your tissues are being asked to do.

The practical rule: a niggle that appears during the taper is usually not a new injury, and race week is not the time to investigate it. You don’t have enough runway to rehabilitate anything meaningful. What you do have is enough time to settle it down.

That means: don’t start a new strengthening programme, don’t book a deep tissue massage you’ve never had before, don’t add stretching you don’t normally do, and don’t change your shoes. Race week is for doing less of what you already do, not more of something new.

The exception is anything that looks like a bone stress injury — a sharply localised pain you can point to with one finger, pain that’s worse with impact and doesn’t warm up, night pain. That’s worth a call regardless of what the calendar says.

What to actually do

Start two weeks out. Three if you’ve been doing very high volume, one if you’re racing something short.

Halve the volume, progressively. Not all at once. Roughly: first taper week at about 70–80% of normal, race week at about 50% or less.

Keep the hard sessions, shrink them. If you normally do 6 × 1km at threshold, do 3 × 1km at the same pace. The pace is the point; the quantity isn’t.

Run the same number of days. Resist the urge to take extra rest days. Frequency is doing work you can’t feel.

Keep the last quality session at least 3–4 days out. Close enough to feel sharp, far enough to have recovered.

Change nothing else. Not your shoes, not your breakfast, not your warm-up, not your mattress. Race week is the worst possible time to introduce a variable.

Expect to feel bad on about day four. Plan for it. It is not information about your fitness.

If you’re coming into race week carrying something

The honest version: if something has been bothering you for weeks and you’ve left it until now, the goal has changed. You’re not fixing it this week — you’re managing it to the start line and dealing with it properly afterwards.

What usually helps: reduce the aggravating variable rather than stopping entirely, keep moving, and have a plan for what you’ll do if it flares mid-race.

What usually doesn’t: a brand new intervention three days out.

And the broader point — the version of this problem that turns up in September is a conversation. The version that turns up in race week is a compromise. If you want the build and the taper to fit your history rather than a template, that’s what our sports physiotherapy assessments are for. The same logic applies when you’re adding training volume at the other end of a block, and in more detail again for anyone building towards Ironman WA.

Sources

On Form Physiotherapy is Perth’s endurance sport clinic. If something’s niggling in the lead-up to a race, or you want a build and taper that fit your history rather than a template, book an assessment or call (08) 6385 8029.

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