Doing hard things grows the brain's tenacity hub

The Short Version

Across at least four episodes, Andrew Huberman keeps coming back to one brain region: the anterior mid-cingulate cortex (aMCC). He presents it as a hub for tenacity and willpower that appears to get bigger when you do safe things you would rather not do, and to shrink when you avoid challenge [1][2][3][4]. The evidence he cites comes from several directions: brain imaging during hard tasks, studies of successful dieters and high achievers, lower activity in depression and learned helplessness, brain stimulation that makes patients feel ready to face a coming challenge, older adults whose aMCC grew with six months of aerobic exercise, and "super-agers" who keep this region large into their 80s and 90s [1][4]. The practical lesson is specific. The challenge only counts if you don't want to do it: a hill sprint you dread at the end of an enjoyable run, a cold shower you hate, a hard conversation you've been putting off [3][4]. That turns a vague idea like push through discomfort into a small habit you can practise daily or weekly, with the caveat that much of the evidence is correlational and that the drive to resist can go too far, as it does in eating disorders [1][3].

Table of contents

What They Said

The willpower episode: introducing the aMCC [1]

Huberman's fullest treatment comes in his solo episode on willpower and tenacity. The summary says he clearly fell in love with the aMCC while researching it [1]. He calls it a region most neuroscientists barely know, and says more than two dozen studies link it to tenacity [1].

Defining the terms. Huberman separates willpower from habit. Habits (getting up, getting sunlight, brushing your teeth) run on circuits you already have and take little effort. Willpower means stepping in to override your own default habits or thought patterns, and that costs effort and neural energy [1]. He places willpower on a scale running from apathy and depression at one end to tenacity, grit and persistence at the other, with motivation as the engine that moves you along it [1]. He respects the "just do it" slogan but notes it offers no fallback when it stops working, and everyone, even David Goggins or Courtney Dauwalter, has days when telling themselves to do something isn't enough [1].

Where it is. The aMCC is part of the larger cingulate cortex, in the frontal lobes about a third of the way back from the forehead, one on each side, just above the corpus callosum [1]. Huberman credits Lisa Feldman Barrett with pointing him to it and highlights a review she co-authored, The Tenacious Brain: How the Anterior Mid-Cingulate Contributes to Achieving Goals [1][4].

Several lines of evidence. Huberman lists findings from different kinds of human research [1]:

• In brain imaging, aMCC activity rises during hard tasks compared with easy ones.
• High academic achievers show more resting activity in the aMCC.
• Damage to or disruption of the aMCC is linked to apathy, depression and reduced tenacity in every area of life.
• Successful dieters show higher resting activity, which rises further when they resist tempting food; people who failed to lose weight for medical reasons, and people with obesity, show lower activity.
• People with clinical depression or learned helplessness show reduced activity.
• People with anorexia nervosa, the deadliest psychiatric condition, show heightened aMCC activity at rest and when shown food.
• Super-agers, people over 60 (some in their 80s and 90s) with the thinking of much younger adults, keep a significantly larger aMCC, even though this region normally shrinks between 60 and 90.

Two sides of willpower. Huberman frames willpower as two statements: "I absolutely will" and "I absolutely won't" [1]. A region that handles both, he reasons, must work like a dimmer rather than an on-off switch, and must have access to context and reward information [1]. The anatomy fits. The aMCC connects to autonomic centres that control heart rate and breathing, indirectly to the immune and hormone systems, to areas that plan or suppress movement, to the dopamine reward system, and to regions that track how we feel inside (interoception) and what's around us (exteroception) [1]. He recalls Robert Sapolsky's point that one of testosterone's major jobs in the brain is "to make effort feel good." [1]

Stimulation: the will to persevere. The most striking evidence comes from Stanford colleague Josef Parvizi's 2013 paper in Neuron, The Will to Persevere Induced by Electrical Stimulation of the Human Cingulate Gyrus [1]. In patients undergoing brain surgery for other reasons, precise stimulation of the aMCC produced a feeling that something challenging was coming and that they would push through it [1]. One patient described something like a storm in the distance they knew they had to go into and could get through; another felt they needed to marshal resources and resist [1]. Sham stimulation produced nothing, and stimulating neighbouring areas didn't produce the effect [1].

Allostasis: allocating energy. From Lisa Feldman Barrett, Huberman takes the idea of allostasis. Homeostasis is the body's drive for balance; allostasis is about directing resources to particular functions depending on goals [1]. The aMCC seems to work like a dial for how much fuel each part of the brain and body gets: favouring visual areas during a task that needs careful looking, or quieting everything except what keeps you running in a race [1]. This also explains why even very tenacious people need to ease off. They still need sleep, habits and the ability to change strategy, not necessarily because willpower runs out but because constant resistance doesn't help in most of life [1].

It can be built. The aMCC doesn't only send commands; it also receives input. Moving the body activates it, and forcing or encouraging yourself to move activates it more [1]. Reading, listening and learning activate it too, but far more when you are overcoming resistance [1]. In non-human primates, and to a limited extent in humans, the region is packed with molecules linked to synaptic plasticity, such as CaM kinase II, neurotrophin receptors and NMDA receptors [1]. That means it can grow, and because the same structure serves every area of life, building it through one challenge should carry over to others [1].

The exercise study. Huberman describes a 2006 study by Colcombe and colleagues, "Aerobic exercise training increases brain volume in aging humans." [1] Previously sedentary adults aged 60 to 79 did either aerobic exercise or stretching and calisthenics, one hour three times a week for six months [1]. The aerobic group started at about 50% of maximum heart rate and moved up to around 60 to 75%, which Huberman likens to zone three, where talking is hard but you aren't gasping [1]. Compliance was 85% [1]. The main brain region that held or grew in volume in the aerobic group was the aMCC, along with white matter tracts connecting the two sides of the frontal lobes. The stretching group showed no comparable change, and the researchers weren't looking for this result [1]. Huberman's interpretation is that the benefit came not from running or cycling as such but from what it took to show up: getting off the couch, saying no to other things and pushing into unfamiliar effort [1].

The key condition: resistance. The challenge has to involve resistance. If you already love cold showers, they won't build more tenacity, though they may maintain what you have [1]. If you already do plenty of cardio, three hours a week may not be a new stimulus [1]. The same goes beyond exercise: learning an instrument or a language as an adult, if it's hard for you and you've been avoiding it, should engage the aMCC [1]. Easy tasks and automatic habits don't [1].

Micro-sucks. For people who already exercise, Huberman offers what he jokingly calls micro-sucks: small, safe things you don't want to do, done on purpose [1]. His examples: one extra set at the end of your usual sets; 100 jumping jacks after a hard run; five minutes sitting still reviewing what you just learned instead of grabbing your phone; not checking texts and email during a workout; getting into a cold shower when you really don't want to; or, if you already fast safely, waiting an extra 15 minutes before your first meal [1]. The more you want to do something else, the more the aMCC is engaged. If you're excited to do the jumping jacks, they won't help [1]. It isn't about any one protocol but about doing what you least want to do, or resisting what you most want, in a given moment [1].

Endeavours with no finish line. Huberman recalls his graduate school qualifying exams, where examiners kept asking questions until he said "I don't know," much like the impossible puzzle in Roy Baumeister's willpower experiments. Learning to keep going in that situation carries over to life [1]. Super-agers, he notes, are always doing something hard for them, such as learning pottery or music or entering unfamiliar environments, with a sense of playfulness [1]. Drawing on Alia Crum's work on mindset, he describes a closed loop: using tenacity strengthens the aMCC, which makes tenacity easier to reach next time [1]. He speculates, while admitting it gets squishy for a scientist, that the aMCC's role in directing resources toward goals may relate to what we call the will to live [1].

Rewarding the relief. His final protocol comes from a recent animal study in Neuron on stress relief as a natural resilience mechanism. When a stressor ends, the relief is itself rewarding and reinforces the tenacity that got the animal through; adding a reward after the stress increased the capacity to handle future stress [1]. Huberman suggests occasionally, not every time, rewarding yourself with something healthy you enjoy after doing a hard thing, consistent with his warnings elsewhere against rewarding every win [1].

The Sydney Q&A: challenge that generalizes [2]

Asked about the latest science of stress at the Sydney Opera House, Huberman named two areas where he feels the field is moving fastest: Alia Crum's work on stress mindsets and the aMCC research by Parvizi and other labs [2]. He described the stimulation reports in the patients' words: "I'm leaning in," and "I feel like I'm going to get up out of my chair and do something really, really difficult." [2] Across multiple people, he said, the response was the same general forward-leaning reaction toward challenge [2].

He then went further than in the solo episode: there are "scores of studies in just the last three to five years" showing that people who overcome a challenge, whether physical or cognitive, see this region expand or at least increase its baseline activity, while "people that fail to meet that challenge" show less activity [2]. He summarised: "it seems that doing things that are difficult, that we don't enjoy or that we have to push ourselves to do" grow and enhance activity in this region, "and the beauty of it is that it generalizes." [2]

That, he argued, is a call for balance: seeking pleasure, comfort, relaxation, sleep and morning sunlight, "But also deliberately seeking out challenges, that is challenges for us." [2] He stressed doing hard things "in a safe manner, psychologically and physically safe manner" [2]. He tied this to David Goggins, whom he once watched set off to run about 14 miles to the airport [2].

The 2023 AMA: uncomfortable but safe [3]

In an end-of-2023 Ask Me Anything, the very first listener question was about the aMCC, and Huberman gave the most concise version of the idea [3]. It is, he said, "a region of the brain that is involved in leaning into difficult challenges of all kinds," one "that gets larger when we embrace effort" that brings a bit of internal anxiety, "and this is an area of the brain that gets smaller When we don't engage in challenging endeavors" [3].

He was precise about what counts: "Challenging endeavors that stimulate the growth" of the region "are challenging endeavors that we would prefer not to do." [3] You may want the result, the fitness or the learning, "but that the challenge itself feels uncomfortable," and it should be "Uncomfortable but safe" [3]. He added that the region is bigger in people who succeed at dieting, fitness or finishing a degree, and shows some atrophy in people who fail to do the preparatory work [3].

His own example makes the point concrete. His Sunday long run or hike is enjoyable, "pure bliss for you the whole way through," and so "That's not going to grow" the aMCC; adding some higher-intensity work, such as a couple of hard hill sprints at the end that feel rough, would [3]. He also widened the range of challenges: they "can come from physical endeavors and come from language learning it come from a hard conversation that you're You've been putting off" [3].

On super-agers he offered a correction and a caveat. He'd rather call them "super non-agers" because their memory and IQ remain stable or even improve [3]. Their aMCC doesn't shrink, but "this is correlation," and "there still needs to be more data collected on this." [3] What the studies suggest is that these people "Are regularly engaging in things that are hard for them and challenging and they've embraced that challenge" [3]. The feeling to look for, he said, is "that friction that feeling. Oh, I don't want to do this I can't do this and then continuing to practice or continuing to lean into that challenge safely" [3]. He described the aMCC as a "barometer of how well we are doing" at keeping the brain healthy [3].

His dose is modest: "I'm a big fan of trying to do something difficult at least one thing Ideally every week And perhaps even every day a little bit it doesn't take much Maybe even just five minutes." [3] Later, answering a question about uneven arm strength, he passed on the best training advice he ever got, to "learn to enjoy training really hard," and tied it back to the aMCC [3].

The exercise-and-brain episode: the fifth essential [4]

In his episode on exercise and the brain, Huberman lists four kinds of training for brain health: long slow cardio, high-intensity intervals, time under tension, and explosive jumps with controlled landings. Then he adds a fifth: "that fifth category is the one that you absolutely don't want to do." [4]

He calls the aMCC "a brain area that is powerfully engaged when we lean into challenges, including physical challenges, but also mental challenges, emotional challenges." [4] It is "a major hub for inputs from other brain areas and outputs to other brain areas," connected to the dopamine, arousal, learning and stress systems [4]. Super-agers, he explains, "maintain the healthy full volume of these brain areas" while their peers in their 60s, 70s, 80s and 90s lose them, even without Alzheimer's [4]. He summarises Barrett's review: the region's activity tracks grit, persistence, willingness to exert effort, estimates of how much effort something will take, and the value placed on that effort, and stimulating it increases the will to persevere [4].

How to grow it? "Well, it's very simple to do things that you don't want to do." [4] He is careful: "We're talking about things that can be done safely that aren't going to damage you physically or psychologically." [4] Because he loves resistance training, lifting doesn't count for him: "I absolutely have to find some form of physical exercise that I would much rather not do." [4]

His personal choices show the rule in practice. He loves heat and nearly hates cold, so: I do deliberate cold exposure by cold shower or by cold immersion because I hate it. And because I know that by doing it, I'm going to be activating my will to persevere, my grit, my willpower. [4] He notes that every step, from walking toward the tub to getting in, is a hurdle [4]. Because his schedule already holds six workouts a week, he chose something short but dreaded for 2025: rope flow, which his friend Mark Bell introduced him to, swinging a thick rope in precise patterns around the body [4]. "Feel free to laugh if you want, but this stuff is hard." [4] He picked it as "the one thing that I've been putting off for years that frankly, I may enjoy down the line, but that I don't enjoy currently." [4] He jokes that if he starts to enjoy it, he'll need to find something else, and invites listeners to share the safe exercise they most dread and commit to it [4].

Where They Agree, and Where They Don't

Since all four sources are Huberman, the question is how consistent he is across time and formats.

Consistent across all four:

• The aMCC is a hub for tenacity and willpower [1][2][3][4].
• It responds to doing hard things you don't want to do, not to hard things you enjoy [1][3][4].
• Challenges must be physically and psychologically safe [1][2][3][4].
• Super-agers keep this region large [1][3][4].
• Parvizi's stimulation work, with patients reporting a challenge coming and a readiness to lean in, is the signature finding [1][2][4].
• The benefit is general: building it in one area should help in others [1][2].

Where his framing shifts:

• How strong the evidence is. In Sydney he speaks confidently of "scores of studies" showing expansion after success [2]. In the willpower episode he says more than two dozen studies link the region to tenacity [1]. In the AMA he stresses that the super-ager link is correlation and needs more data [3]. The direct evidence that effort causes growth rests largely on one aerobic exercise study in older adults, and the idea that the effort of showing up, rather than the exercise itself, drove the growth is Huberman's own interpretation [1].
• Growth versus activity. Some findings concern the region's size (the exercise study, super-agers, atrophy in people who don't prepare) and others its activity (imaging during hard tasks, resting activity in dieters) [1][2][3]. Huberman sometimes blends them, as in "expands or at least increases its baseline levels of activity" [2].
• How much. The AMA suggests one difficult thing a week, ideally a few minutes a day [3]. The willpower episode offers a menu of daily micro-sucks [1]. The exercise episode builds dreaded exercise into the weekly plan [4].

The important counterpoint: too much resistance. Huberman repeatedly warns that tenacity can become harmful. People with anorexia nervosa show heightened aMCC activity, with reward pathways seemingly activated by avoiding food [1]. He warns against letting micro-sucks slide into unhealthy stoicism or disordered eating, and says being able to turn the drive off matters as much as turning it on [1]. Even the most tenacious people need to come off the gas, because constant resistance doesn't help in most of life [1]. So the aMCC story is not more is always better.

Why It Works

The mechanisms Huberman gives:

• It is wired to the body's effort systems. The aMCC links to autonomic centres for heart rate and breathing, the dopamine reward system, motor planning areas, and regions tracking internal and external states [1][4]. That puts it in a position to decide how much effort to spend and where.
• It allocates energy toward goals. In Barrett's allostasis model it works like a dial, sending fuel where current goals demand it [1].
• It learns from what it receives. Movement activates it, and forcing yourself to move activates it more; learning activates it more strongly when you're overcoming resistance [1]. Its rich supply of plasticity molecules (CaM kinase II, neurotrophin receptors, NMDA receptors) suggests it can be strengthened with use [1].
• Its activity tracks effort and its value. Barrett's review links it to grit, persistence, willingness to exert effort, estimates of effort, and the value placed on effort [4].
• Stimulating it produces the feeling of tenacity. Parvizi's patients felt a coming challenge and the resolve to meet it, and neighbouring areas and sham stimulation didn't produce this [1][2][4].
• Relief reinforces it. Animal work suggests the relief after stress, especially with an added reward, strengthens the capacity to face future stress [1].
• A self-reinforcing loop. Using tenacity strengthens the aMCC, which makes tenacity easier next time [1].

Huberman also names a foundation: willpower rests on the autonomic nervous system, and sleep deprivation, pain, illness, hunger or distraction all lower it, whatever else you do [1]. Autonomic circuits feed straight into this hub, which is why sleep and stress management come first [1].

Where It Applies, and Where It Doesn't

Applies to:

• Anyone whose training or learning has become comfortable. Enjoyable routines keep you where you are but don't build more [1][3].
• Older adults. The exercise study involved previously sedentary 60- to 79-year-olds, and super-agers keep this region while peers lose it [1][4].
• Challenges beyond fitness: learning a language or instrument as an adult, or a hard conversation you've been avoiding [1][3].

Does not apply, or needs care:

• Things you already enjoy. If you love cold showers or long runs, they won't count [1][3].
• Unsafe challenges. Huberman repeatedly says challenges must be physically and psychologically safe [2][3][4]. New eccentric or jumping work, for instance, often brings soreness and injury, so start low and progress slowly [4].
• Eating disorders and compulsive restraint. Heightened aMCC activity in anorexia shows the downside of relentless resistance. Fasting-related micro-sucks are only for people who already fast safely [1]. Anyone with a history of disordered eating should talk to a clinician before using restraint-based challenges.
• Exhaustion. Without good sleep and stress control, willpower tools won't help for long [1]. After a poor night, Huberman advises lighter exercise and care with coordination, because injury risk rises and immunity drops [4].
• Certainty. Much of the evidence is correlational, and the super-ager connection in particular needs more data [3].

What To Do With It

1. Find your dreaded, safe challenge. Ask what you have been putting off that you don't want to do but could do safely: cold showers, hill sprints, rope flow, a language, a hard conversation [3][4]. If you enjoy it, it doesn't count [1][3].
2. Add hard work to the end of an easy session. Finish an enjoyable run or hike with a couple of hard hill sprints that feel rough [3], or add one extra set or 100 jumping jacks at the end [1].
3. Do a little often. Aim for at least one difficult thing a week and ideally a few minutes every day [3].
4. Use micro-sucks outside the gym. Sit still for five minutes to review what you just learned instead of picking up your phone; keep your phone away during a workout [1].
5. Take on something with no finish line. Learn a skill that stays hard for a long time, like pottery, music or a language, with a sense of play, as super-agers do [1].
6. Watch for the friction. The signal is the thought "Oh, I don't want to do this," followed by continuing safely anyway [3]. When a challenge stops feeling like that, change it [4].
7. Protect sleep and manage stress first. They set the ceiling on willpower [1].
8. Reward yourself now and then. After getting through something hard, sometimes, not every time, enjoy something healthy you like [1].
9. Know when to stop. Tenacity should have an off switch. If resisting food, rest or comfort becomes compulsive, or you have a history of eating disorders, stop and get professional advice [1].

Sources

1. How to Increase Your Willpower & Tenacity | Huberman Lab Podcast · Huberman Lab
2. LIVE EVENT Q&A: Dr. Andrew Huberman at the Sydney Opera House · Huberman Lab
3. Summary Ama 14 2023 Philanthropy Evening Routine Light Therapy Health Metrics More · Huberman Lab
4. How to Use Exercise to Improve Your Brain’s Health, Longevity & Performance · Huberman Lab