Does exercise increase IQ?

Exercise does not raise underlying ability much in adults, but it reliably improves attention, working memory and executive function – all of which affect test performance. In children, regular activity is associated with higher academic outcomes and modest IQ gains.

Aerobic or strength training?

Aerobic training has the strongest evidence for fluid reasoning and hippocampal growth. Strength training also helps executive function. Combining both, plus everyday movement, gives the widest cognitive benefits.

The WHO guideline of 150 minutes of moderate activity per week is sufficient to see cognitive effects. Even a 20-minute brisk walk temporarily improves attention and working memory.

BackgroundPublished July 20, 20265 min read

Exercise and Cognition: How Physical Training Boosts the Brain

Regular aerobic exercise increases brain volume in memory-critical areas and improves cognitive performance. Here's how much training actually makes a measurable difference.

Moving your body is one of the best-documented ways to sharpen cognition. The effect is not magic – it comes from concrete biological changes in the brain that show up on imaging and cognitive testing.

What the research shows

Aerobic exercise raises BDNF (brain-derived neurotrophic factor), a growth factor that stimulates neurogenesis in the hippocampus – the memory hub. A well-known Erickson et al. (2011) study showed that older adults who walked 40 minutes three times a week for a year had larger hippocampal volumes, while controls shrank at the normal rate of ageing.

Aerobic or strength?

Aerobic training has the strongest evidence for the fluid abilities measured by intelligence tests. Strength training also helps executive function. Best results come from combining both.

How much?

150 minutes of moderate activity per week is enough to show cognitive effects. A single 20-minute walk temporarily improves attention and working memory, measurable on a free IQ test taken right after.

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FAQ

Does exercise increase IQ?: Exercise does not raise underlying ability much in adults, but it reliably improves attention, working memory and executive function – all of which affect test performance. In children, regular activity is associated with higher academic outcomes and modest IQ gains.
Aerobic or strength training?: Aerobic training has the strongest evidence for fluid reasoning and hippocampal growth. Strength training also helps executive function. Combining both, plus everyday movement, gives the widest cognitive benefits.
How much is enough?: The WHO guideline of 150 minutes of moderate activity per week is sufficient to see cognitive effects. Even a 20-minute brisk walk temporarily improves attention and working memory.