How much exercise does your brain need?

Does a daily walk count? The weekly exercise target in plain numbers, what to add after 65, and what exercise does and doesn't do for your brain.

October 4, 2026 · Updated October 4, 2026 · 2 min read

A clay sneaker and a small water bottle sit beside a park bench on a light mint surface.

If you walk briskly most days, you may already be close. Adults need 150 to 300 minutes of moderate activity a week, which works out at about 20 to 45 minutes a day. A walk counts if it gets you breathing harder. There is no separate number for the brain: this is the World Health Organization's advice for your health as a whole, and thinking and memory are among the things it covers.

How much is enough each week?

The WHO's guidelines give adults three ways to get there:

150 to 300 minutes a week of moderate activity, or
75 to 150 minutes a week of vigorous activity, or
a mix of the two.

Vigorous minutes count about double, which is why that range is half as long. On top of this, aim for muscle-strengthening work on two or more days a week, using all the major muscle groups.

Does walking count?

Yes. Walking sits alongside cycling and dancing and anything else that raises your breathing and heart rate. The test is effort. A gentle stroll where your breathing never changes won't get you there. Pick up the pace until you notice your breath and your heart working, and you are in the right range.

What changes after 65?

The weekly amounts stay the same, and so does the muscle work. One thing is added: on three or more days a week, do varied activity that works on balance and strength, at moderate effort or more. The aim is to keep you steady on your feet, able to do everyday things for yourself, and less likely to fall.

What does exercise actually do for your brain?

Several studies link being active with better brain health. In one randomised trial, exercise made a part of the brain involved in memory and learning larger, and people got better at remembering where things were.

Whether exercise can prevent a decline in thinking is not yet known.

Where do you start?

Start with the walk you already take and make it brisk enough to feel. Add a day or two of something that works your muscles, such as lifting weights or a strength class. After 65, choose activities that also test your balance.

If you live with a health condition, have a quick word with your doctor first about which kinds of activity suit you.