Doing hard things grows the brain's tenacity hub

Andrew Huberman's answer, repeated across at least four episodes, is that one brain region, the anterior mid-cingulate cortex (aMCC), acts as a hub for tenacity and willpower, and that it appears to grow when you do safe things you would rather not do and to shrink when you avoid challenge. The catch is in the wording: the challenge only counts if you don't want to do it.

In his solo episode on willpower he lays out the evidence. Activity in the aMCC rises during hard tasks. It is higher at rest in high academic achievers and successful dieters, and lower in depression and learned helplessness. Super-agers, older people with the thinking of much younger adults, keep the region large even though it normally shrinks between 60 and 90. In Josef Parvizi's stimulation study, patients felt a challenge coming and a readiness to push through it. And in a 2006 study, previously sedentary adults aged 60 to 79 who did aerobic exercise for six months held or grew aMCC volume, while a stretching group did not. Huberman credits Lisa Feldman Barrett for pointing him to the region and for the idea that it directs the body's energy toward goals.

The later episodes sharpen the rule. In an end-of-2023 AMA he says the challenge should be "Uncomfortable but safe" and uses his own Sunday long run as an example: it is enjoyable, so it won't grow the region, but a couple of rough hill sprints at the end would. In his exercise and brain episode he adds a fifth kind of training to his list: "that fifth category is the one that you absolutely don't want to do." For him that means cold exposure, which he hates, and rope flow, which he had put off for years. Lifting doesn't count because he loves it.

All four sources are Huberman, so the differences are in his own framing. In Sydney he spoke confidently of scores of studies showing the region expands after people overcome a challenge. In the willpower episode he cites more than two dozen studies linking it to tenacity. In the AMA he stresses that the super-ager link is correlation and needs more data. The direct evidence that effort causes growth rests largely on the one exercise study, and the idea that the effort of showing up drove the growth is his own interpretation. He also sometimes blends findings about the region's size with findings about its activity.

There is an important counterpoint. People with anorexia nervosa show heightened aMCC activity, and Huberman warns against letting small challenges slide into unhealthy stoicism or disordered eating. Being able to turn the drive off matters as much as turning it on. Willpower also rests on sleep and stress management, which come first.

What to do with it: pick something safe that you have been putting off and don't want to do, such as a cold shower, hill sprints, a language or a hard conversation. Do at least one difficult thing a week, ideally a few minutes a day. Add what he calls micro-sucks, like one extra set or five minutes reviewing what you just learned instead of reaching for your phone. When a challenge becomes enjoyable, change it. Reward yourself with something healthy now and then, not every time. If resisting food, rest or comfort becomes compulsive, or you have a history of eating disorders, stop and get professional advice; anyone with a history of disordered eating should talk to a clinician before using restraint-based challenges.