This episode of Science of Ultra addresses how much training volume is needed for ultramarathons, building on prior discussions where mileage was key. The core answer is simple: do as much as you can tolerate and enjoy, without accumulating ongoing fatigue. Tracking by distance or time likely doesn’t matter, as evidence is weak; what matters is consistent, appropriate stress with recovery. The host provides rough volume guides: for a 50K, 30 miles/week to finish and over 50 for performance; for 50M or 100K, 40 miles/week to finish and over 60 for performance; for 100M, 50 miles/week to finish and more for performance. He emphasizes planning schedules based on available time, with buy-in from family, and choosing events that match your training capacity. Doubles can increase stimulus without extra volume, but long runs shouldn’t be split unnecessarily. Cross-training is valuable for adding fitness with less impact, especially for older athletes. Progression should be gradual, with weekly fatigue checks and a training diary. The host cautions against overtraining and celebrates pain, advocating for sustainable, joyful training. Sustainable limits exist (e.g., ~2.5x resting metabolic rate), but most athletes don’t need extreme volumes. Ultimately, finding your baseline takes time—years—and requires methodical exploration of your body’s capacity, with intensity distribution addressed in a future episode.
this is science of ultra the knowledge resource for achieving your ultra endurance best
train and perform smarter and now your host dr sean bearden how much running and how much overall
exercise training should you be doing to prepare yourself for ultra marathons or other major
endurance adventures near the end of 2020 i published an episode titled mileage matters most
where i presented the science and practice supporting the notion that the most important
factor in your training after consistency is the total mileage that you run this episode
is meant to complement that narrative and extend it by specifically addressing the question of how
much you should be training this is not a question about the optimal distribution of your training
in terms of intensity or modalities but rather
the simple question of overall volume and the simplest answer is that you should be doing as
much as you can tolerate and enjoy and that may seem like dodging the question but i work hard
to dig into the evidence and emerge with practical and actionable messages following the rule that
the simplest answers are most likely the best whenever there isn't
clear evidence that something more complicated is warranted there are however factors and ideas
that will be useful for different people and for different times in your season
and over your running career yes even amateurs can call it a career
first let's mention the elephant in the room should you quantify this volume by distance or time
there are reasons for and against using either some people have a difficult time keeping easier
days truly easy when they run by distance and have a busy life you know it's too tempting to run too
fast on an easy day when you still have to go grocery shopping before heading home other people
draw great motivation from relating distance run to an upcoming event like running the equivalent
of the upcoming event each week
we could list many other considerations and similar scenarios for running by time
there is some research that finds a stronger correlation between training distance and
performance than between training time and performance but the quantity of evidence is
very small and the quality is low given the marginal differences in already low correlations
at this point it's reasonable to say that it probably doesn't matter if you train by distance
or time what does matter is that you're providing the right stresses to your body so that appropriate
strain along with appropriate recovery provides the adaptations relevant for your goals and
objectives which brings us back to the notion of running as much as you can handle without
accumulating fatigue
it's okay to accumulate a little bit of fatigue but if you've taken on so much that a full recovery
week of easy running and reduced volume doesn't turn you back into an excited energetic and
motivated runner then it was too much and your next cycle should be at a lower volume and possibly
with fewer high intensity sessions but more on high intensity sessions in a coming episode
the recommendations for minimal durations or distances to achieve goals is based on coaching
and athlete real world practice not on research because we don't have any research specifically
addressing this question that isn't a failing of scientists but rather the result of an
appreciation for the fact that different people can consistently tolerate huge differences in
training programs what makes a difference is the amount of time you spend in training and the
amount of time you spend in training and the amount of time you spend in training and the amount of
time you spend in training and the amount of time you spend in training and the amount of time you
spend in training and the amount of time you spend in training and the amount of time you spend in
training and yet those two people may cross the finish line of an ultra marathon in the same time
all that really matters for you is finding how much training you can do how much training you
want to do and then going with whichever is less your maximum will likely be determined by how much
time you have to train considering the rest of your training time and the amount of time you have to
train considering the rest of your training time and the amount of time you have to train considering
the rest of your training time and the amount of time you have to train considering the rest of your
life rather than what your body can really handle or be trained to handle start by writing down the
days of the week and filling them in with how much time you have each day for training share that
with your family and friends to get their input seriously it won't be sustainable to plan a
program that doesn't have buy-in from the other important people in your life a fitting observation
made by james clear is you do not rise to the level of your goals you fall to the level of
your systems don't set up a system that is going to put undue strain on the things that are truly
most important to you your schedule may change predictably throughout different times of the year
for work family or other commitments if the weekly schedule can't be changed you can't
accommodate different amounts of training throughout the year for whatever reasons you might
come up with a schedule for each quarter of the year or even each month depending on your
circumstances whatever your situation be clear and open about the time available each day of the week
for as long as you can make reasonable estimates then and this bit is extremely important be joyous
about what you can do to make sure that you're doing the right thing and that you're doing the
best you can do what you have available don't question or second guess the plan do not if you
are prone to this type of thinking question whether you can squeeze a little more time into
the schedule this one workout or be granted forgiveness by your spouse for running just an
extra bit longer tonight or fantasizing about whether you could be a better athlete if you
just had more time for training no
focus on what you have and go with it it's fine to adjust the schedule by revisiting it with everyone
in your life who's affected but bending and stretching the schedule generally leads to
problems know that doubles where you train twice in one day can be a great way of increasing
stimulus on slightly less volume or creating a greater stimulus on the same volume by doing two
runs in a day or a run in a bike starting the second within two to five hours of finishing the
first and each one being at least 30 minutes you can potentially create a greater stimulus
to at least some factors that support endurance adaptations i discussed this research with the
person who's done most of it in episode 126 with david bishop bishop
you
you
you
you
there are critical benefits of doing long runs so don't split up a long run when you can do it
but rather keep in mind that it's okay and perhaps even beneficial at times to run some in the morning
and then again at lunchtime for example if that helps with scheduling your training you're not
losing out by doing a double sometimes or even making it a regular thing when it works well for
you all of the best endurance workouts are going to help you do that so don't split up a long run
athletes in the world train more than once per day on most days, after all.
So both the science and the practice support doing doubles.
So you now have a rough guide for your schedule based on the time you have available.
Should you fill all of it with training? Of course not. Just because you can doesn't mean you should.
It's wonderful if you have four hours per day to exercise, but can your body really handle that
much training? Maybe not. This is why you should plan for the lesser of the time you have available
or the amount you can handle without accumulating ongoing fatigue. A funny thing happens in the
minds of many runners at this point in the conversation. Most people are with me up to this point, but when
the conversation turns to events a person is training for, these practical principles get pushed aside
in the charge for that shiny object that is the finisher's medallion or buckle.
We choose arrays without consideration for whether the required training volumes
are within our reach. People charge on, overload the training. Too much increase, too fast. Arrive and
survive, hopefully. Then lick wounds after the event while reveling in the stories of how rough it was.
There is too much celebration of carnage and pain in our sport.
Yes, I said that twice.
I previously talked about not bending your training in episode 120.
The key points to reiterate now are to choose events for which you can train in a manner
that is both appropriate for the demands of the event and comfortably achievable for
your body in the context of the time you have available.
If you can't get to the necessary training load with comfortably adaptable progression
by race day, then put that race on to the next year and seriously plan getting to that
volume in time.
I don't care if your name.
Did get drawn in the lottery.
Shame on you for submitting for it when you weren't ready to get ready.
So how much training volume is needed for races or events of different standard distances?
I've melded my own coaching experience with what other respected coaches have written
on this subject to arrive at a rough guide, a very rough guide.
If you want to see this guide, just click on the link in the description for this episode
in your podcast player, and that will take you to the show website page for this episode
where you'll find all the text.
For a 50K, we're looking for 30 miles per week to finish the race and more than 50 miles to finish the race.
For a 50K, we're looking for 30 miles per week to perform well for at least three weeks before your taper.
For a 50 mile or 100K race, we're looking for 40 miles per week of training just to finish
and more than 60 miles per week to perform well for at least five weeks before your taper.
And for a 100 mile race, we're looking for 50 miles per week to just finish and more than 50 miles to finish.
It may also help you to plan a multi-year progression to test whether you can gently nudge that ceiling higher over years,
especially if you want to really perform at races that are 100 miles or longer.
And there are known maximums for our species.
Almost nobody is going to push those boundaries, but there are some people who try.
Herman Ponser, soup guest in episode 134,
has published research showing that the upper limit for indefinite sustainable energy expenditure in Homo sapiens
is about 2.5 times resting metabolic rate,
which means that you can expend more than 2.5 times your resting metabolic rate,
but only for short periods of time, like days or weeks, possibly months.
Long term, you cannot absorb and utilize enough energy
on a daily basis to be able to do that.
So, if you're going to do that, you're going to have to do a lot of research.
And if you're going to do that, you're going to have to do a lot of research.
On a daily basis, to sustain greater outputs indefinitely,
your body literally deteriorates without adaptation.
That's roughly a marathon a day or possibly a 50K a day.
And while there are some people training well in excess of 200 miles per week,
they're rare, and it's not sustainable for many months or years.
But it is incredible.
To appreciate that volumes close to that are potentially sustainable
for very long periods of time for some people.
There is, however, no evidence that such huge volumes
are useful for performance in ultramarathons.
It is likely that everyone will maximize the performance benefits
of increasing training distance long before such huge,
large distances are achieved.
One way to increase your total training volume and a great way
to maximize your cardiovascular strain is to cross-train.
By hiking, biking, skiing, rowing, using an elliptical machine,
or any other exercise modality, you can add overall fitness
without the damaging wear and tear of extra running.
This can be useful early in the day.
If you need a break during the running season,
for people returning from time off or injury,
if you just need a mental break,
or for those new to running,
and for those who are more susceptible to impact-related breakdowns
such as older athletes.
An important caveat here, however,
is that older runners should be exercising most days of the week,
if not all.
It's far better to do some exercise every day,
even for 30 minutes,
than to exercise 60 minutes every other day as we age.
The more regular stimulus is necessary as we age,
because we become more resistant to the exercise stimulus.
This is also why we have to weightlift with higher weights
to maintain muscle mass.
We become resistant to the stimulus and require a higher and more regular
input signal as we age.
A good approach for older athletes
is to increase overall training volume
by adding non-running, non-impact training,
like cycling, elliptical, rowing, swimming, hiking, etc.
And then decide how much of that, if any,
can be converted to running.
But make the conversion at a reduced amount,
because the trauma of pounding while running
is a great stress per unit time.
So, for example,
after adding up to 3 hours of cycling per week
for a few weeks or months,
you might consider converting that cycling time to running,
but you'd exchange each hour of cycling
for maybe 20 minutes of running.
Now, a quick note on progression.
How do you safely progress your volume
if that's what you have time for,
what you want to do,
and you're handling your current volume easily?
I'm a fan of exercising at least 6 days per week
for everyone who can do it.
Even if it isn't always running.
Once a person is exercising at least 30 minutes per day
for 6 days per week,
then the duration of each session can be increased,
or we can add doubles on any day.
I would rather distribute the increases in volume as we go
so that we're adding 20 minutes to 3 days
per week rather than a full hour on one day,
for example.
In general,
I try to keep the longest days of a week
within 3 times the shortest days.
So, if we're doing a 3-hour long day,
then none of the other exercise days
contain less than an hour of total exercise.
We can deviate from that rule
when you do really long days
for those who need extra time
and extra long sessions
in preparation for an event.
But I find that it is a useful framework
for general training
because it keeps the overall load
distributed throughout the week.
We want to avoid the weekend warrior effect
where we train just a little
or not at all during the week
and then have massive weekends.
That leads to stagnated training
development and increases injury risk.
As you increase time or distance, avoid increasing the quantity of high-intensity work too much.
I sometimes hear the rule to increase only distance or intensity, but never both.
And I think that's too rigid a rule.
It can be okay to increase both sometimes, as long as the combined additional strain of the two is tolerable.
If you have more training time available than your body can handle, then increment your time or distance a little bit every few weeks.
Sustain that volume for a few weeks and take careful notes on conditions you are running in, along with how you feel overall.
When I say conditions you're running in, I'm talking about everything that impacts how you feel overall, from road versus trail to hot versus cold.
And at that point, then, back off.
At the end of each week, ask whether you're feeling more fatigued than you felt at the end of the previous week.
If the answer is yes, drop the volume a little for the next week.
This is a multi-year project.
Embrace that.
When you're preparing for a specific event, race or adventure, it can be okay to increase the amount of time you're running in.
You can increase the total volume a bit above what you've identified as indefinitely sustainable.
And once in a while, you may undertake a big weekend that pushes you over your weekly limit.
These things are all fine when they're temporary and for a specific purpose, knowing that you've planned a proper recovery period immediately after the increase.
What we're focused on right now is finding the sustainable volume to use as your ongoing in-season baseline.
Over the season, and especially over years, that baseline may increase.
Or it may not.
Or you may even find that you don't need quite as much volume to happily achieve your goals.
Once you find that baseline, and again, it may take a year or more,
then you can explore the efficacy of adjustments to your training intensity distribution,
which is how much moderate, hard, or severe intensity training you do.
Training intensity distribution is a very important part of your training.
Training intensity distribution will be the subject of a new episode a little later this spring.
So if you're going to really take these episodes that I'm sharing to heart and really implement them,
this exercise takes work.
By exercise, I don't mean your training session today.
I mean the exercise of figuring out your upper limit.
Many of you will already know that from years of experience.
But many of you just have a vague idea of it.
Or maybe no idea at all.
It's critically important to keep a diary
and write down all of the factors that can contribute to your fatigue.
And rigorously assess each week, how am I really feeling?
It's only through having consistent weekly training,
with only small changes in things like intensities and distances,
that you're able to really get a feel
for what your body can handle over time
when the other factors are also taken into consideration,
like sleeping right and eating right and work and life stresses.
But it's only through paying close attention to these factors
that you can truly understand what you can handle.
And if you're pushing your limits,
to go after really big goals and objectives,
and you don't want to succumb to this ever too popular notion
that pain and hurt is somehow something we should be going for,
but rather aim to explore the limits of your own joys and happinesses and abilities,
then it's important that you do that from an educated standpoint.
And the only way you're going to get that,
is by digging into it yourself.
Looking at what you can really do over time and methodically exploring it.
Getting this right takes planning, consistent training,
a well-populated training diary,
and attention to all the facets of your training.
Because how you sleep, think, eat, and move all play a role
in helping you become your ultimate goal.
Ultra best.
Podcast Summary
Key Points:
Training volume for ultras should be as much as you can tolerate and enjoy, balancing time available and body capacity.
Distance vs. time for tracking volume likely doesn’t matter; focus on providing appropriate stress and recovery.
Minimal volume guides
Doubles (two sessions, 2-5 hours apart, each ≥30 min) can boost stimulus without extra volume, but don’t split long runs when possible.
Cross-training (cycling, hiking, etc.) adds fitness with less impact, especially useful for older athletes or injury-prone runners.
Progress volume gradually (e.g., add 20 min to 3 days/week), keep longest days within 3x shortest, and avoid weekend-warrior patterns.
Sustainable limits exist (e.g., ~2.5x resting metabolic rate indefinitely), but huge volumes (e.g., >200 mi/week) aren’t necessary for performance.
Keep a training diary, assess fatigue weekly, and adjust volume; prioritize joy and sustainability over pain and carnage.
Summary:
This episode of Science of Ultra addresses how much training volume is needed for ultramarathons, building on prior discussions where mileage was key. The core answer is simple: do as much as you can tolerate and enjoy, without accumulating ongoing fatigue. Tracking by distance or time likely doesn’t matter, as evidence is weak; what matters is consistent, appropriate stress with recovery.
The host provides rough volume guides: for a 50K, 30 miles/week to finish and over 50 for performance; for 50M or 100K, 40 miles/week to finish and over 60 for performance; for 100M, 50 miles/week to finish and more for performance. He emphasizes planning schedules based on available time, with buy-in from family, and choosing events that match your training capacity. Doubles can increase stimulus without extra volume, but long runs shouldn’t be split unnecessarily.
Cross-training is valuable for adding fitness with less impact, especially for older athletes. Progression should be gradual, with weekly fatigue checks and a training diary. The host cautions against overtraining and celebrates pain, advocating for sustainable, joyful training.
5x resting metabolic rate), but most athletes don’t need extreme volumes. Ultimately, finding your baseline takes time—years—and requires methodical exploration of your body’s capacity, with intensity distribution addressed in a future episode.
FAQs
The simplest answer is to do as much as you can tolerate and enjoy, balancing time available with what your body can handle without accumulating ongoing fatigue. Your maximum is likely set by your schedule and life commitments rather than physical limits.
It probably doesn't matter whether you train by distance or time, as evidence is limited and low quality. What matters is providing the right stresses to your body for adaptations relevant to your goals.
For a 50K, aim for 30 miles per week to finish and over 50 miles to perform well. For 50 mile or 100K, 40 miles weekly to finish and over 60 miles to perform. For 100 miles, 50 miles weekly to finish and more to perform, sustained for several weeks before taper.
Exercise at least 6 days per week, then increase duration gradually, adding 20 minutes to 3 days rather than an hour on one day. Keep longest days within 3 times the shortest, and avoid large increases in high-intensity work simultaneously.
Doubles can increase training stimulus on slightly less volume or create greater stimulus on the same volume, especially if the second session starts within 2-5 hours of the first and each is at least 30 minutes. They can help with scheduling, but don't split long runs when possible.
Yes, cross-training like cycling, hiking, or rowing can add overall fitness without extra running impact, useful for breaks, injury return, or older athletes. Older runners should exercise most days, and can convert cross-training time to running at a reduced amount.
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