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.
Learn more about what IQ actually measures and what different scores mean.
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
Editorial team focused on cognitive testing & psychometrics research
Last updated
May 10, 2026
MyIQScores content is written and maintained by our editorial team using published research in cognitive psychology and psychometrics as its source base. We label estimates as estimates, link primary sources where available, correct errors when readers flag them, and update pages as research or feedback warrants — see our corrections policy.