EXERCISE
Endurance Exercise and Cognition: How Aerobic Training Grows the Brain’s Memory Centre
Memory is not a fixed trait; the brain region that sustains it, the hippocampus, is continuously reshaped by our way of life. One of the most robustly studied ways to positively influence the function and structure of the hippocampus is endurance exercise. Aerobic training such as brisk walking, running, cycling or swimming triggers a biochemical cascade in the nervous system that supports growth and plasticity.
This article gathers the peer-reviewed evidence on the effects of endurance exercise on cognition. We examine the role of the growth factor BDNF, the increase in hippocampal volume, the formation of new neurons known as neurogenesis, and what these findings mean for the brain health of knowledge workers. The NeuroAudit method examines exercise as one of the central pillars of cognitive load tolerance.
BDNF: Fertiliser for the Brain
Brain-derived neurotrophic factor, BDNF, is a protein often called fertiliser for the brain because it supports neuronal survival, growth and the strengthening of synaptic connections. BDNF is a key regulator of neuroplasticity, and its levels are directly linked to the capacity for learning and memory function.
Endurance exercise is an effective way to raise BDNF levels. Cellular research shows that exercise increases BDNF gene expression in the hippocampus through specific metabolic pathways (Sleiman et al. 2016). A meta-analysis in older adults confirms that regular training measurably raises resting serum BDNF levels (meta-analysis 2024).
The importance of BDNF is also evident in clinical research. A review of the effects of physical exercise on BDNF in neurodegenerative disease highlights the growth factor’s role in protecting the nervous system (PMC review 2025). BDNF conveys the benefits of exercise to the brain and partly explains why physically active people retain cognitive performance better with age.
- BDNF supports neuronal survival, growth and the strengthening of synaptic connections.
- Endurance exercise measurably raises BDNF levels both at the cellular level and in resting serum.
- Higher BDNF levels are linked to better learning capacity and memory.
The Hippocampus Grows: Structural Evidence
Perhaps the most striking evidence of the brain effects of endurance exercise is structural. In a significant randomised trial, aerobic training increased hippocampal volume in older adults, and this structural change was linked to improved memory (Erickson et al. 2011). The finding was pivotal because it showed that age-related brain shrinkage is partly reversible through exercise.
The growth of the hippocampus is explained by neurogenesis, the formation of new neurons. Research shows that exercise promotes neurogenesis in the hippocampus specifically through BDNF-mediated mechanisms (Liu and Nusslock 2018). In this way BDNF and the structural change in the hippocampus link together into a coherent biological chain.
In a large analysis of UK Biobank data, physical activity was associated with more favourable brain structure and better cognition at the population level (Raichlen et al. 2020). These observations confirm that the brain benefits of exercise are not confined to the laboratory but are visible in large populations.
From Cognition to Clinical Prevention
The benefits of endurance exercise extend from healthy cognition to disease prevention. A randomised controlled trial showed that aerobic training produced positive effects in a group at risk of Alzheimer’s disease (Morris, Vidoni et al. 2017). While exercise is not a cure, it is one of the few lifestyle factors with consistent evidence for slowing cognitive decline.
A broad review of the links between physical activity, cognition and the brain summarises that regular exercise supports executive function, attention and memory across all age groups (Erickson et al. 2019). This makes endurance exercise one of the most cost-effective investments in brain health.
For knowledge workers these findings are especially relevant. Executive function and attention are precisely the cognitive functions that modern knowledge work loads most heavily. Regular aerobic exercise therefore acts as a direct support for work capacity and cognitive resilience.
- Aerobic training produced positive cognitive effects in a group at risk of Alzheimer’s disease.
- Regular exercise supports executive function, attention and memory across all age groups.
- Executive function and attention are the cognitive functions most heavily loaded by knowledge work.
Practical Recommendations to Support Cognition
Achieving cognitive benefits does not require the training volume of an elite athlete. Based on the evidence, even moderate-intensity aerobic exercise such as brisk walking several times a week is enough to trigger the BDNF-mediated cascade and support hippocampal function. Consistency and persistence are what matter.
In the NeuroAudit method, exercise is assessed as part of a holistic picture of brain health. Adding endurance exercise to a weekly routine is a concrete, measurable action that supports memory, mood and cognitive load tolerance. Combined with adequate sleep and recovery, its effect on brain health is substantial.
- Even moderate-intensity aerobic exercise several times a week supports hippocampal function.
- Consistency and persistence matter more than the intensity of any single session.
- Combine endurance exercise with adequate sleep and recovery to maximise the brain benefits.
