Tapering for a Race: How Long, How Much and How to Survive Taper Madness
Updated: Oct 27
Written by Andy Hood · Ultra runner, cancer survivor and Runna ambassador
Updated 27 October 2027 | Published 9 June 2026
Article contains affiliate links/codes that support this blog and Andy's cancer charity work.
The quick answer on tapering for a race: Tapering is the planned cut in training in the final days or weeks before a race. You reduce your weekly mileage by roughly 40 to 60%, keep some short, sharp running in, and arrive fresh. Done right, it can make you around 2 to 3% faster, which in one study of 158,000 marathoners was a median of five and a half minutes.
Tapering at a glance:
How long: about a week for a 5K, 7 to 10 days for a 10K, 10 to 14 days for a half, 2 to 3 weeks for a marathon or ultra.
How much to cut: 40 to 60% of your peak weekly volume, stepped down week by week.
Intensity: keep it. Shorter efforts at race pace and a few strides, not slow jogging.
Frequency: keep most of your runs, just shorter. Drop a day or two in race week.
The payoff: around 2 to 3% faster on race day.
Golden rule: the fitness is already banked. You can't add any now, but you can tire yourself out.
There's a moment in every training block when the plan does something cruel. After 14, 16, maybe 20 weeks of early alarms, long runs and sessions that leave you face down on the kitchen floor, it tells you to do less.
That's the taper. And for something designed to make you faster, it can make you feel absolutely dreadful.
I've tapered for everything from half marathons to 160km around Mont Blanc. I've had the heavy legs, the calf that suddenly twinges after five silent months, and the race bag packed, unpacked and packed again. So here's what the taper actually does, how long yours should be, and how to get through it without driving your other half up the wall.
Contents
What Is Tapering in Running?
Tapering is a planned drop in training load before a key race, so the fatigue clears but the fitness stays. Training load is three things: volume (how much you run), intensity (how hard) and frequency (how often).
Here's the bit that matters. Hard training makes you fitter and more tired at the same time, and the tiredness hides the fitness. By the time you reach the taper, the adaptations are already in the bank. The taper simply lifts the fatigue blanket off so the fitness can turn up on race day.
One quick clarification, because the words look alike: tapering is not taping. Taping is the colourful kinesiology strips on calves and knees. Tapering is winding down your running. I've had that conversation more than once.
How Long Should You Taper? Taper Length by Race Distance
The longer the race, the longer the taper: about a week for a 5K, up to three weeks for a marathon or ultra. Longer races pile up more fatigue and lean harder on your fuel stores, so they need more time to recover from.
Race distance | Taper length | What to know |
5K | About 7 days | Keep the speed work. Fuel isn't what limits you |
10K | 7 to 10 days | Last hard session around 7 to 8 days out |
Half marathon | 10 to 14 days | Longest run roughly 14 days before |
Marathon | 2 to 3 weeks | The classic taper. Final long run around 3 weeks out |
Ultra marathon | About 3 weeks | Longer recovery from the final big efforts |
A useful rule of thumb: the shorter and faster the race, the shorter and gentler the taper. A 5K is about speed and sharpness, so you keep some fast running in the final week. A marathon is about endurance and fuel, so the taper is longer and leans towards rest and refuelling.
Not every race needs a full taper either. Save the proper one for your "A" races, the ones you've built the whole block around. A tune-up half in the middle of marathon training might get a few easy days and nothing more.
Why Is Tapering Important Before a Race?
Tapering matters because you can't build meaningful fitness in the last two weeks, but you can arrive tired or injured. Months of training leave you with micro-damage in the muscles, depleted fuel, a run-down immune system and a nervous system stuck in high gear. Carry all that to the start line and you race tired, however fit you are.
The temptation, especially first time round, is to cram. You panic that you haven't done enough and squeeze in extra miles. It's one of the most common and costly mistakes in endurance running. A hard session takes days or weeks to turn into fitness, and there simply isn't time.
In the final 7 to 10 days, a hero workout does more harm than good. The job is no longer to gain fitness. It's to protect it.
Plenty of race-day blow-ups and last-minute injuries trace straight back to training too hard, too late.
Does Tapering Make You Faster? The Science of the Taper
Yes. A well-built taper typically makes you around 2 to 3% faster, and the research on it is unusually consistent.
The big review. A 2007 meta-analysis of 27 studies found the best results came from a two-week taper that cut volume by 41 to 60%, while keeping intensity and frequency the same (Bosquet et al.).
Real runners, real races. A study of collegiate distance runners found 8K race times improved by about 3% after a three-week taper (Luden et al., 2010).
Recreational marathoners. An analysis of more than 158,000 marathoners' training logs found a strict three-week taper was linked to a median finish 5 minutes 32 seconds faster than a minimal taper, or 2.6% (Smyth and Lawlor, 2021).
That last one is the one I like. Not elites in a lab, but ordinary runners like you and me, and the ones who stuck to the taper ran faster.
So what's going on under the hood?
Your fuel tanks refill
Glycogen is your stored running fuel, and heavy training keeps it constantly topped down. Cut the volume, keep eating well, and your muscles refill. Glycogen holds water as it's stored, which is why taper legs often feel heavy and full. That heaviness is fuel, not lost form.
Your muscles repair and get more powerful
The micro-damage from months of pounding finally gets a chance to heal. In that collegiate runner study, the fast-twitch fibres grew by about 7%, with absolute power up around 9% after the taper. Your legs genuinely come back stronger.
More blood, more oxygen, more time to fatigue
One classic study tested three different week-long tapers on middle-distance runners (Shepley et al., 1992). The low-volume, high-intensity taper raised blood volume and improved running time to fatigue by 22%. The rest-only taper did neither, and time to fatigue actually dropped slightly.
Your aerobic engine stays switched on
In the same study, a key aerobic enzyme rose with the high-intensity taper and fell with complete rest. That's the single best argument against putting your feet up for a fortnight.
Your nervous and immune systems catch up
Heavy training keeps your body in fight-or-flight mode: higher resting heart rate, poorer sleep, slower recovery. The taper lets it switch back to rest and recover. It's also why some runners pick up a sniffle in taper week, as the body finally deals with what it's been putting off. There's usually time to shake it off.
One thing the taper doesn't do is raise your VO2 max. In Shepley's study it didn't move under any of the three tapers. The taper doesn't make you fitter. It lets you show the fitness you already have.
How to Taper for a Marathon: Volume, Frequency and Intensity
To taper properly, cut your volume hard, trim your frequency gently and keep your intensity. You have three dials, and they matter in that order. The same principles apply to a half or an ultra, just over a different length of time.
Volume: turn it down hard
Cutting mileage is by far the most powerful lever. Aim to drop total volume by 40 to 60% from your peak week, stepping down week by week rather than in one sudden cliff edge. If you peaked at 70 miles, your race week might bottom out around 30 to 40.
Frequency: ease it back gently
The research says the best tapers keep frequency much the same, so keep most of your runs and make them shorter. That keeps your routine and your running rhythm intact right up to the line. Many plans, mine included, still drop a day or two in race week itself, which is fine. Just don't go from five runs a week to one.
Intensity: keep it up
This is the counterintuitive one. Do not turn every run into a slow jog. Keep some race-pace efforts and strides, just less of them: 6 x 400m instead of 12, or two miles at marathon pace instead of six.
In short: run less, but don't run soft.
Sample three-week marathon taper
Here's how that looks for a runner who peaked at 40 miles a week. It's an example to show the shape, not a prescription.
Week | Weekly mileage | % of peak | Long run | Quality to keep |
3 weeks out | 32 miles | 80% | 14 to 16 miles | One marathon-pace session |
2 weeks out | 24 miles | 60% | 10 to 12 miles | Shorter marathon-pace session, plus strides |
Race week | 16 miles plus the race | 40% | 4 to 6 miles | A few short marathon-pace blocks early in the week, strides |
For a half, squeeze that into roughly the last 10 to 14 days. For an ultra, the shape is similar to the marathon, but the long runs in week three are usually time on feet rather than miles.
What to Do During Taper Week
In taper week, run short and sharp, sleep more, fuel well and sort your race-day logistics early. The taper frees up time and energy, and the difference between a good taper and a miserable one is often just having a plan for it.
Keep the legs ticking over with strides
After an easy run, add 4 to 8 strides of 20 to 30 seconds at race pace or a touch quicker, with full recovery between. They keep the legs switched on and remind them what fast feels like, without adding fatigue. They're a confidence boost too.
Sleep is your best recovery tool now
Aim for solid, consistent sleep, eight hours or more if life allows. Here's a useful one: the night two nights before the race matters more than the night before, because nerves often wreck that last one. Bank it early in the week.
Carb load for the half, marathon and ultra
For races over about 90 minutes, increase your carbohydrate gradually over the final 36 to 48 hours. Precision Fuel & Hydration suggest 8 to 12g of carbs per kg of body weight per day, which is 560 to 840g for a 70kg runner (Precision Fuel & Hydration). Think rice, potatoes, pasta, bread, oats and bananas, not one heroic pasta dinner.
For a 5K or 10K, skip it. Eat normally and stay hydrated. For the full method, see my guide to carb loading for a marathon or ultra.
And no, you don't need to give up coffee in taper week. I looked at the research in caffeine and running, and a withdrawal headache is the last thing a grumpy taperer needs.
Gentle mobility, not new training
Light yoga, foam rolling, easy stretching and walking are all great. Drop heavy strength work in the final week or two and keep it to light maintenance. Now is not the time to discover a new class.
Practise the mental side
Use the spare time to rehearse the race in your head: the start, your pacing, the hard miles and how you'll respond. Scroll back through your training log and remind yourself of the work in the bank. It's a direct antidote to taper doubts.
Sort the logistics early
Study the course map. Test your race-morning breakfast. Check your kit for chafing, charge the watch, pin the bib, and plan travel, parking and timing to the start. Nothing new on race day, and that includes shoes, so pick from your tried and tested rotation.
Enjoy having a life again
Training, especially marathon training, eats your time. The taper hands some of it back. See people, read, catch up on hobbies. Treat it as part of the plan, not a guilty pleasure.
What Is Taper Madness? Why the Taper Feels So Hard
Taper madness is the restlessness, anxiety, mood swings and phantom aches that hit many runners when training drops off before a race. It's completely normal. Runners have plenty of names for it: taper tantrums, maranoia, or simply "I'm fine, why do you ask?" Runna's coaches put it at up to 78% of marathon runners (Runna).
Here's why it feels so awful.
You lose your daily endorphin hit
For months, running has been regulating your mood, energy and stress. Take a big chunk of it away and you feel restless, irritable and flat. It's a kind of withdrawal.
All that energy has nowhere to go
Suddenly you have time and energy you'd normally spend on long runs. So you spend it fretting: checking splits, rereading the plan, second-guessing your shoes and repacking the same bag five times.
Phantom pains appear out of nowhere
A calf that's been silent for five months suddenly twinges. An Achilles feels tight. A hip feels "off". Usually these aren't injuries. Your body is busy repairing months of micro-damage, and your under-occupied mind finally has the space to notice every sensation.
Your legs feel heavy and stale
This catches almost everyone. As glycogen refills and draws in water, your legs feel fuller and heavier, and runners read it as lost fitness. It's the opposite. Those heavy taper legs are often the ones that feel electric a few miles into the race.
Your sense of self wobbles
For 12 to 20 weeks your identity has been tied to weekly mileage and that satisfying tiredness. When the plan tells you to do less, it can feel like losing control of the outcome.
Rest isn't the absence of training. It's the final, decisive part of it.
Here's the reassuring bit. The runners who feel worst in the taper are almost always the ones who trained properly, because there's real fatigue lifting. The misery is a sign it's working. Trust the work.
How I Taper: An Ultra Runner's Taper Week
I embrace the taper, and dare I say it, I actually enjoy it. It wasn't always that way.
When you're in a training block, you know it's coming. In the week or two before the race you've worked so hard for, the taper arrives, and it can be something you approach with complete dread. You back off the running, fewer days and less mileage, and suddenly have a whole lot more time to overthink the last 14 weeks.
Let's be honest, you've probably been running five days a week, some days for hours. When I'm training for an ultra, the long runs take me out for five, six, seven hours at a time, and then there are the strength sessions on top.
The weeks fly by, you hit the runner's high, and the dopamine hits are fantastic. Then it all stops. Well, nearly. In the taper you might run two or three times a week, often for less than 45 minutes. So what do you do with the rest of your time? Build a Lego model, perhaps. Or drive your other half mad overthinking the race. For me I often write more blog articles, expect to see a spike in new posts during my taper weeks.
I'll use the time to reflect on the block. The highs and the lows, the runs that stand out for all the right reasons and all the wrong ones. The windy, rainy and sunny days, the evening runs and the early mornings. It's all brought me to this point.
In the final two weeks I get my kit checked and top up anything I need, gels and drinks mostly. I book a leg massage, and I confirm arrangements for race day and usually the day or night before, as I'm often travelling.
I get a social media plan clear in my head too. Having been through cancer and a second emergency operation in recent years, I talk and share openly, because if one person reads it and laces up, or books that check-up, it's worth it.
And I give myself a pat on the back. It wasn't easy getting to this point. I've worked hard, and I acknowledge that. The taper is part of the training block, and I absolutely love getting there.
Does Runna Build the Taper In for You?
Yes. Every Runna race plan builds the taper in automatically, so you don't have to work out when to cut, by how much, or what to keep.
Everything above is the why. The honest truth is that getting the taper right by hand is where a lot of runners come unstuck, and it's where a good plan earns its keep.
I train with Runna, and I'm proud to be a Runna ambassador. It rebuilt my running after cancer, and again this year after emergency surgery. When you set up a plan, it's personalised to your current fitness, your goal race and your race date. The final stretch is laid out the way the science says it should be: volume stepping down, your running days easing back, quality kept in, strides included, and fresh legs on the start line.
You don't have to second-guess the numbers. The plan has already done the maths. I've written more on how Runna plans build the taper in.
Deload weeks: a mini taper every month
There's a second piece that matters just as much, and it runs through the whole block: the deload week. Every fourth week in a Runna plan is a recovery week, where the load eases off before building again. It's the week newer runners most want to skip.
Your strength, endurance and speed are built in the recovery weeks. The hard weeks provide the stimulus; the adaptation happens when you back off.
A deload week is really a mini taper. Learn to trust those, and the real taper feels a lot less scary.
If you're weighing up apps, I've written a full Runna vs Strava comparison. And if you're choosing a goal race, I've got guides to training for your first marathon, your first half marathon and your first 50K, plus a London Marathon and World Marathon Majors training plan. I'm training for London 2027 myself, and you can follow along in my Road to London series.
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Common Tapering Mistakes to Avoid
The most common tapering mistake is trying to squeeze in extra fitness. Here are the ones I see most often.
Cramming in a confidence long run. A 20-miler two weeks out won't add fitness. It'll add fatigue you can't recover from in time.
Resting completely. Total rest leaves you stiff, anxious and flat, and lets your aerobic engine slide. Keep running, just less.
Cutting out all intensity. Slow jogging alone leaves you sluggish. Keep the strides and short, sharp efforts.
Cutting too much, too soon. Dropping well below 40% of your normal mileage, or doing it overnight, tends to leave legs heavy rather than fresh.
Using a marathon taper for a 5K. Three weeks of minimal running before a short race leaves you stale, not rested.
Over-carb-loading for short races. A big carb load before a 5K or 10K just means bloating and a dodgy stomach.
Trying anything new. New shoes, new gels, new breakfast, new pre-race routine. Race week is for the tried and tested only.
Panicking over phantom pains and heavy legs. They're normal taper signals, not injuries or lost fitness. Sharp, worsening pain is different, so get that checked.
The taper is the bit of training you can't see on Strava, but it's where the whole block pays off. Run less, sleep more, eat well and trust the work you've banked.
Less is more. See you on the start line.
Tapering for a Race: Frequently Asked Questions
What does tapering mean in running?
Tapering in running is the planned reduction in training, mainly weekly mileage, in the final days or weeks before a race. It clears the fatigue built up over months of training while keeping your fitness, so you reach the start line fresh, fuelled and ready to race.
How long should I taper before a race?
How long you taper depends on the race distance. Allow about 7 days for a 5K, 7 to 10 days for a 10K, 10 to 14 days for a half marathon, and 2 to 3 weeks for a marathon or ultra. The longer the race, the longer the taper.
How long should a marathon taper be?
A marathon taper should usually last two to three weeks. A study of more than 158,000 recreational marathoners found a strict three-week taper, where every week is lower than the last, was linked to a median finish 5 minutes 32 seconds faster than a minimal taper.
How long should a half marathon taper be?
A half marathon taper is usually 10 to 14 days. Run your longest run roughly two weeks before the race, then cut your mileage progressively while keeping some race-pace running and strides so your legs stay sharp.
How much should I reduce my mileage when tapering?
Reduce your mileage by about 40 to 60% from your peak week when tapering, stepping it down week by week. Keep the intensity of your key efforts, keep most of your runs but make them shorter, and save the biggest cut for race week.
Should I stop running completely during a taper?
No, you shouldn't stop running completely during a taper. Total rest can let your aerobic fitness slide and tends to leave you flat and anxious. In one study, a rest-only taper made runners slightly worse, while a short, sharp taper improved time to fatigue by 22%.
Why do my legs feel heavy during the taper?
Your legs feel heavy during the taper because your muscles are refilling their glycogen, which stores water alongside it. That fuller, heavier feeling is a sign of stored fuel and recovery, not lost fitness, and those legs usually feel strong once the race starts.
Is taper madness normal?
Yes, taper madness is completely normal. Many marathon runners, up to 78% by Runna's figures, feel anxiety, mood swings or phantom aches during the taper. It comes from losing your daily endorphin hit and having spare energy and time to worry. It usually means the taper is working.
Are phantom pains during the taper real injuries?
Phantom pains during the taper are usually not real injuries. Your body is repairing months of micro-damage, and with less running your mind notices every niggle. Pains that come and go are normal. Sharp, persistent pain, or anything that changes how you run, should be checked by a physio.
Does tapering actually make you faster?
Yes, tapering makes you faster, typically by about 2 to 3%. For a recreational marathoner that's around five minutes. The taper doesn't build new fitness. It removes fatigue, refills your fuel and restores muscle power, so you can show the fitness you've already trained.
Should I carb load during the taper?
Carb load during the taper only for races longer than about 90 minutes, such as a half, marathon or ultra. Increase carbohydrate gradually over the final 36 to 48 hours using familiar foods. Before a 5K or 10K there's no need, so just eat normally and stay hydrated.
Should I do a long run the week before a marathon?
No, you shouldn't do a proper long run the week before a marathon. Your last long run should be about three weeks out. In race week, keep runs short, around 4 to 6 miles at most, with a few strides or short race-pace efforts to stay sharp.
Will I lose fitness during a taper?
No, you won't lose meaningful fitness during a two to three week taper. Studies show VO2 max stays the same through a well-planned taper. Fitness only starts to fade with much longer breaks or complete rest, which is why you keep running, just less.
What's the most important thing to do in taper week?
The most important thing in taper week is to trust your training and protect your freshness. Don't try to add fitness or squeeze in extra miles. Sleep well, eat well, run easy with a few strides, sort your race logistics early, and arrive at the start line rested.
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This article is based on my own experience and the published research. It isn't a substitute for individual coaching or medical advice. If you have a persistent pain or a health concern, speak to a qualified professional.
About the Author - Andy Hood
Andy Hood is an ultra and endurance runner based in North Devon, a testicular cancer survivor and a proud Runna ambassador.
Diagnosed in 2021 after a timely prompt from Jeremy Clarkson to check, he rebuilt his running with Runna's structured, personalised plans, and did it again after emergency surgery in 2026. He has tapered for and raced everything from half marathons to 160km around Mont Blanc, and heads to Chamonix for UTMB week most years.
He designs bold running challenges to raise awareness of testicular cancer, including the Krispy Kreme London 50, and has raised over £28,000 for cancer and mental health charities. He is the founder of Check Ya Balls, menswear that saves lives, and will run the 2027 TCS London Marathon for The Robin Cancer Trust.
Follow his runs on Instagram @runningwestwardho or read more at runningwestwardho.co.uk.
Sources: Bosquet et al. (2007), Luden et al. (2010), Shepley et al. (1992), Smyth and Lawlor (2021), Precision Fuel & Hydration and Runna. Checked 27 October 2026.
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