Exercise and the brain: midlife women who lift weights react fastest

Those squats you are thinking of doing today are good for more than your legs. A new study on exercise and the brain found that women who exercised regularly kept quicker reactions and stronger working memory as they got older. The women who lifted weights reacted fastest of all.

That is welcome news if you are in midlife and have noticed your thinking feels a step slower than it used to. Your routine can work in your favor.

How the study worked

Researchers tested women between the ages of 35 and 63. Each woman did short computer tasks that measured reaction time, working memory and planning. The team then sorted the women by how regularly they exercised and by their main type of exercise: aerobic, resistance (strength) training or something else. The results were published on Oct. 27, 2026, in Medicine & Science in Sports & Exercise. The study compared women at one point in time, so it shows a clear link between exercise and sharper thinking rather than proof of cause.

What they found

Reaction time. Slowing down with age is common, and regular exercise eased that slowing. The strength trainers were the standouts. They reacted faster than women who did not exercise regularly, and faster than women who mostly did aerobic or other exercise.

Working memory. Working memory is your mental sticky note. It is how you hold a phone number in your head while you hunt for a pen. The harder the task got, the more exercise helped with response speed. That boost showed up mostly in the older women in the study. Here, the type of exercise did not matter. Walking, cycling and lifting all went with the same advantage.

Planning. Planning skills were tied to age, with no clear link to exercise. The benefits were real, but they were focused on speed and on handling a heavy mental load.

The researchers describe midlife as a sensitive window. In other words, these are good years to build habits that keep your thinking sharp.

Why does strength training stand out?

In this study, strength training was the clear winner for quick reactions. It also helps you keep muscle and bone as estrogen levels fall in midlife, so it can pay off in more than one way. Many women build their routines around walking or cardio. Adding weights, bands or your own body weight fits nicely alongside what you already do.

What you can do today

Do a few slow squats right now, while the coffee brews. Stand with your feet about shoulder width apart, sit back as if reaching for a chair, then stand up. If squats feel like a lot, try wall push-ups instead. Then pick two days this week for a short strength session and put them in your calendar. Start light, focus on good form and add a little more each week. Weights, resistance bands or a backpack with a few books all work.