A few years ago, a neuroscientist at New York University gave a TED Talk about exercise and the brain. It has since been viewed more than 11 million times on YouTube.
Wendy Suzuki’s message was personal as much as scientific. In her 50s, she had stopped exercising and had no social life. When she went back to the gym, her mood lifted and her focus sharpened. She began studying her own transformation through the lens of neuroscience. She learned that exercise is the most transformative thing you can do for your brain. The benefits are immediate, long-lasting, and protective against Alzheimer’s and dementia.
Since that talk, Suzuki has become one of the most respected voices in her field. As she has said many times, it’s never too late to strengthen your mind.
That message has taken on deeper meaning in light of two recent studies.
What the Latest Research Shows
A 2025 study in GeroScience focused on older adults with mild cognitive impairment. One group did twice-weekly weight training for six months. The other didn’t train at all. The weight training group showed improvements in verbal memory and in brain regions linked to Alzheimer’s. The group that didn’t train showed those same regions getting worse.
“Weight training is a strong ally against dementia,” said lead researcher Dr. Isadora Ribeiro, “even for people who are already at high risk of developing it.”
A separate study in Age and Ageing found that a 24-week strength training program triggered protective changes in vulnerable brain regions — and the benefits were strongest in those who already had early Alzheimer’s biomarkers.
Earlier research from the University of Sydney found that brain protection from six months of strength training lasted at least a year after training ended. Professor Michael Valenzuela said resistance exercise “needs to become a standard part of dementia risk-reduction strategies.”
Why It Works
Strength training strengthens the hippocampus and prefrontal cortex — two primary targets of Alzheimer’s and dementia. It improves blood flow to the brain, lowers inflammation, and triggers the release of proteins that help brain cells grow and survive. When you build muscle, your muscles send signals to your brain. The two are more connected than most people realize.
None of these studies required serious athletes. Just two to three sessions a week, working major muscle groups.
In the most recent research, it’s precisely those people already experiencing early decline who showed the most meaningful improvements from strength training.
That’s the quiet revolution in this research. It isn’t just telling healthy people to stay healthy. It’s telling people who are already worried that they still have options, and that those options are real.
As Wendy Suzuki would say: It’s never too late to strengthen your mind.
Holly Kouvo is a personal trainer, functional aging specialist, senior fitness specialist, brain health trainer, writer, and speaker.