How to Taper for a Marathon:
The Final Three Weeks

The Principle

What Tapering Is and Why It Works

Through a marathon build you are deliberately carrying fatigue. You train, you get tired, you adapt, and you repeat. At any point in that block your actual fitness is masked by the tiredness sitting on top of it. The taper is simply the process of removing the tiredness so the fitness underneath can show up on race day.

It is not a rest. It is a controlled reduction. And it works: a systematic review of tapering in endurance athletes found meaningful performance improvements from a progressive reduction in training volume, with intensity maintained. The consistent finding across the literature is that the volume comes down and the hard efforts stay in, just shorter.

"Nothing you do in the last three weeks will make you fitter. Plenty of things you do in the last three weeks can make you slower."

The gains are not trivial either. A well-executed taper is typically worth a couple of percent, which over 26.2 miles is several minutes. That is more than most runners gain from any single training block.

Duration

How Long Should Your Taper Be?

Two to three weeks. Where you land inside that depends mostly on your training volume.

If you have been running 60 to 100 miles a week, you have accumulated a lot of fatigue and you need the full three weeks to shed it. If you have been running 30 to 40 miles a week, a two week taper is usually plenty, and a three week taper risks you losing rhythm and arriving flat.

Age matters too. The masters runners I work with almost always need a slightly longer, gentler taper than they did fifteen years earlier, for exactly the reasons covered in our guide to recovery for masters runners.

The Plan

How to Structure the Three Weeks

Three weeks out: the last big week ends

Your final long run sits here, typically 18 to 20 miles depending on your target. After that, volume starts coming down. Aim for roughly 80 percent of your peak weekly mileage across this week. Keep both quality sessions in, at full intensity, but shorten them. A session that was 6 x 1 mile at marathon pace becomes 4 x 1 mile.

Two weeks out: the real reduction

This is where the volume drops properly, to around 60 percent of peak. Your long run comes down to 10 to 12 miles, run easy. Keep one solid session, something like 3 x 2 miles at marathon pace, and make the rest of the week genuinely easy. Drop your last heavy strength session around here. Our guide to strength training for runners covers how to wind that down without losing what you have built.

Race week: short, sharp, boring

Roughly 40 percent of peak volume. Three or four short runs of 20 to 40 minutes. Include a few strides most days and one short block at marathon pace early in the week, maybe 3 x 1 mile or 20 minutes at goal pace on the Tuesday or Wednesday. Rest or a very gentle 20 minute jog the day before.

The aim of race week is to keep the legs turning over and the mind occupied, nothing more. Every session should finish with you thinking you could have done twice as much.

The Mental Side

Taper Madness: Why You Will Feel Awful

Almost every runner feels worse during the taper than they did in peak week. Heavy legs, phantom niggles, disrupted sleep, a conviction that all the fitness has evaporated. I have felt it before every marathon I have run, including the good ones.

Part of it is physiological. When training load drops sharply your body starts repairing everything it has been putting off, and that repair process itself creates a heavy, sluggish feeling. Part of it is simply that you have spare mental capacity for the first time in four months and it goes looking for something to worry about.

It passes. It nearly always lifts in the last three or four days. The important thing is not to react to it by adding a session to prove to yourself the fitness is still there. That is the single most damaging thing a runner can do in taper.

What Not to Do

Six Ways Runners Ruin a Good Taper

Panic sessions. Feeling flat in week two and deciding to prove yourself with a hard 10 miler. You cannot bank fitness this late, only fatigue.

Cutting intensity instead of volume. Runners who spend three weeks jogging arrive rusty. Keep the fast bits, shorten them.

Complete rest in race week. Doing nothing for six days leaves most runners feeling heavy and sluggish on the start line.

New shoes, new gels, new anything. Race week is not the time to test kit or fuelling. Everything should have been rehearsed in training. Our marathon nutrition guide covers what to lock in and when.

Over-thinking carb loading. Increase carbohydrate over the final two or three days, do not attempt to eat a week's worth of pasta on the Saturday night.

Changing your goal upward. If you have been training for 3:15, taper week is not the moment to decide you are going for 3:05. That decision costs more runners a good race than any training error. If you are unsure what is realistic, our pace calculator gives you a sensible target from your current fitness.

Common Questions

Frequently Asked Questions

Summary

The Bottom Line

Reduce the volume, keep the intensity, and hold your nerve. Three weeks out you cut the long run and shorten the sessions. Two weeks out the mileage comes down properly. Race week is short, easy and slightly sharp. Feeling terrible in the middle of it is a sign the taper is working, not that it is failing.

Then trust it. The work is already done. All that is left is to turn up rested and execute the plan, and afterwards, to give yourself a proper marathon recovery before you start thinking about the next one.

If you would rather have someone else make these calls for you, every marathon plan we write includes a taper built around your mileage and your race. Take a look at our coaching packages or get in touch.