Does Exercise Increase IQ?
The Myth: Physical exercise has no real effect on intelligence — brains and brawn are separate.
The Reality: Aerobic exercise is the single most evidence-backed intervention for improving cognitive function. Regular exercise can improve performance by 2-5 IQ points through increased brain blood flow, neurogenesis, and BDNF release.
What the Science Says
Exercise is arguably the closest thing to a real 'smart pill.' Meta-analyses consistently show that aerobic exercise improves executive function, memory, and processing speed. The mechanisms are well-understood: exercise increases cerebral blood flow, stimulates release of BDNF (brain-derived neurotrophic factor, which promotes neuron growth), triggers neurogenesis in the hippocampus (the brain's memory center), and reduces inflammation that impairs cognition. A landmark study of 1.2 million Swedish military conscripts found that cardiovascular fitness at age 18 strongly predicted IQ — and that improving fitness between 15 and 18 was associated with IQ gains. Even a single 20-minute session of moderate exercise temporarily boosts cognitive performance. The practical implication is clear: if you want to perform at your cognitive best, regular aerobic exercise is the most evidence-backed strategy available.
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Frequently Asked Questions
Does exercise increase IQ?
Yes — aerobic exercise is the most evidence-backed cognitive enhancer. Regular exercise improves executive function, memory, and processing speed through increased brain blood flow, BDNF release, and neurogenesis. The effect is equivalent to 2-5 IQ points.
What type of exercise is best for the brain?
Aerobic exercise (running, cycling, swimming, brisk walking) has the strongest evidence. 150+ minutes per week of moderate aerobic activity produces significant cognitive benefits. Resistance training also helps but has less evidence for IQ-type improvements.
How quickly does exercise improve brain function?
A single 20-minute session temporarily boosts cognitive performance. Structural brain changes (increased hippocampal volume, new neuron growth) appear within 6-12 weeks of regular exercise. Long-term exercisers show the largest cumulative benefits.
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MyIQScores Editorial Team
Researchers in cognitive psychology, psychometrics & educational science
Last updated
May 10, 2026
All content on MyIQScores is reviewed for scientific accuracy against peer-reviewed research in cognitive psychology and psychometrics. Our editorial team cross-references each article with published literature before publication and updates pages whenever new research warrants a revision.