The evidence connecting physical exercise to cognitive performance is now substantial enough to be described as a consensus. Exercise — particularly aerobic exercise — improves memory, attention, processing speed, and executive function. These are precisely the cognitive systems that determine how fast and how well you read.
This is not a wellness claim. It is a mechanistic account with documented neurological pathways.
The BDNF mechanism
The most important molecular mechanism connecting exercise to cognition is brain-derived neurotrophic factor (BDNF), sometimes described as "fertiliser for the brain." BDNF is a protein that supports the growth and survival of neurons, promotes synaptic plasticity, and is essential for hippocampal neurogenesis — the formation of new neurons in the hippocampus.
Exercise reliably increases BDNF, particularly in the hippocampus (Cotman & Berchtold, 2002). The hippocampus is the brain region most directly involved in forming new memories — converting short-term exposure to reading into long-term knowledge. Higher BDNF expression is associated with faster memory formation and better consolidation of learned material.
This is not theoretical. Erickson et al. (2011) conducted a randomised controlled trial in which adults over 60 were assigned to either aerobic exercise or stretching for one year. At the end of the year, the aerobic exercise group showed a 2% increase in hippocampal volume — reversing the age-related decline normally seen in that period. The stretching group showed continued hippocampal shrinkage. The aerobic exercise group also showed significantly better spatial memory performance.
Acute exercise and attention
Beyond long-term structural changes, acute exercise produces immediate improvements in cognitive performance that directly benefit reading.
A 2024 meta-analysis of acute exercise and cognition (including multiple randomised studies) found consistent improvements in working memory and executive function within 20–30 minutes after moderate aerobic exercise (Loprinzi et al., 2024). The effects peak roughly 20 minutes post-exercise and persist for 30–60 minutes.
For reading, the relevant acute improvements are:
Sustained attention: Reading a complex text for 30–60 minutes requires maintaining attentional focus over time. Exercise-induced increases in norepinephrine and dopamine in the prefrontal cortex improve attentional persistence.
Working memory capacity: The temporary improvement in working memory following exercise directly benefits the sentence integration and comprehension processes described in our post on working memory and reading speed.
Processing speed: Moderate aerobic exercise increases alertness and processing speed — meaning fixation durations during reading may be shorter after exercise than at rest.
Exercise and reading comprehension research
Direct studies on exercise and reading are less common than studies on exercise and general cognition, but the evidence that exists is consistent.
Sibley and Etnier (2003) conducted a meta-analysis of physical activity and cognitive performance in children, finding consistent improvements in reading-related cognitive skills including attention and processing speed. The effects were not limited to children — subsequent meta-analyses in adults confirmed comparable benefits.
A study by Lambourne and Tomporowski (2010) specifically examined the effect of acute aerobic exercise on cognitive performance, finding that post-exercise improvements were particularly pronounced for tasks requiring working memory, executive function, and sustained attention — all components of skilled reading comprehension.
Sedentary reading and physical health
There is also a relevant feedback loop running in the opposite direction: extended sedentary reading sessions reduce cognitive performance over time.
Research on prolonged sitting shows that extended periods without movement are associated with reduced cerebral blood flow, decreased alertness, and increased mental fatigue. For reading sessions longer than 60–90 minutes, a brief movement break (5–10 minutes of walking) typically restores alertness and processing speed.
The Pomodoro-style reading session — 45–50 minutes of reading, 10 minutes of movement — is not just a time management technique. The movement breaks serve a neurological function: maintaining cerebral blood flow and arousal for sustained cognitive performance.
Practical applications
Morning exercise before reading: 20–30 minutes of brisk walking, cycling, or any moderate aerobic exercise before a reading session positions you at peak post-exercise cognitive performance. Schedule your most demanding reading — dense academic material, unfamiliar domains, complex arguments — in the 30–90 minutes following morning exercise.
Movement breaks during reading sessions: For reading sessions longer than 60 minutes, insert 5–10 minute walking breaks. This is not lost reading time — it restores the attentional capacity needed for the next reading block.
Regular aerobic exercise for long-term benefits: The structural benefits (hippocampal growth, increased BDNF baseline, synaptic plasticity) require consistent exercise over months. A 12-week programme of 3–4 aerobic sessions per week produces measurable cognitive improvements that persist beyond the training period.
Walk and think: Using a treadmill or taking a walking break while mentally reviewing what you have just read is a productive combination. Oppezzo and Schwartz (2014) found that walking improved divergent and convergent thinking — relevant when you want to think through the implications of what you have read.
Reading as part of a cognitive health practice
The research on exercise and cognition places reading in a broader context. Reading is cognitively demanding in ways that may have their own brain-health benefits — the neuroscience of speed reading covers what happens in the brain during skilled reading. But reading is not a substitute for aerobic exercise, and aerobic exercise is one of the most reliable evidence-backed methods for maintaining and improving the cognitive systems that make reading productive.
The ideal approach is not "read more instead of exercising" but "exercise to read better, and read to exercise the cognitive systems exercise has built."
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References
- Cotman, C.W., & Berchtold, N.C. (2002). Exercise: A behavioral intervention to enhance brain health and plasticity. Trends in Neurosciences, 25(6), 295–301.
- Erickson, K.I., et al. (2011). Exercise training increases size of hippocampus and improves memory. PNAS, 108(7), 3017–3022.
- Lambourne, K., & Tomporowski, P. (2010). The effect of exercise-induced arousal on cognitive task performance. Brain Research, 1341, 12–24.
- Sibley, B.A., & Etnier, J.L. (2003). The relationship between physical activity and cognition in children. Pediatric Exercise Science, 15(3), 243–256.
- Oppezzo, M., & Schwartz, D.L. (2014). Give your ideas some legs: The positive effect of walking on creative thinking. Journal of Experimental Psychology: Learning, Memory, and Cognition, 40(4), 1142–1152.
- Loprinzi, P.D., et al. (2024). Effects of acute exercise on cognitive function: A meta-review. Psychology of Sport and Exercise, 72, 102659.
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