# Brain health, memory and focus > Regular activity tends to give a small to moderate boost to thinking and memory, and even light activity may help. Moderate effort such as brisk walking is a good place to start, and some activity is better than none. Exercise can't be promised to fix memory problems or brain fog. - Type: Guide - Topic: Evidence & Guidelines › Mind & Brain Benefits - Status: test content, not reviewed yet - URL: https://twikka.com/learn/brain-health-memory-and-focus - Updated: 2026-10-21 - **A small boost is likely:** Exercise tends to give a small to moderate lift to thinking, memory and planning skills [1]. - **Any movement counts:** Some activity is better than none, and light activity has benefits [2]. - **Start small:** Pick something you can keep doing, then build up how often, how hard and how long. - **Some explanations are still uncertain:** Ideas about brain growth factors, blood flow and inflammation are possibilities, not proven facts. ## Does exercise improve memory and learning? Probably a little. Exercise tends to give a small to moderate boost to thinking overall, and a similar-sized boost to memory [1]. In adults over 50, exercise improved thinking whatever their starting point [3]. The size of the benefit is uncertain, and no clear minimum amount has been shown. If you're starting from little activity, light activity is a reasonable place to begin [1]. Programmes of three months or less did better than those running beyond six months, so a long programme isn't essential [1]. ## What is neuroplasticity, and how does exercise help it? Neuroplasticity is the brain's ability to change its structure, cells and chemistry. Exercise may support this and so help learning and memory [4]. The clearest support comes from animals, where exercise increased growth factors linked to neuroplasticity [5]. In people the picture is much less settled. Suggested routes, such as more blood vessels in the brain and less inflammation, are things exercise may do, not measured results [1]. ## Can exercise improve executive function? Probably, but modestly. Executive function covers skills such as planning and switching between tasks. In healthy older adults, moderate-intensity aerobic and strength training done at least 3 times a week, in sessions of 60 minutes or less, over 26 weeks or less improved it [6]. Across all ages the effect was small [1]. The benefit isn't seen in every group, so treat it as a possible bonus of staying active. ## What is BDNF, and why does exercise raise it? BDNF (brain-derived neurotrophic factor) is a growth-related factor involved in how brain cells work and in brain health. In older adults, some training programmes raised resting levels in the blood, while others changed them little [7][8]. Why exercise might raise BDNF is a suggestion rather than established fact [6]. Don't read a higher level as meaning better memory or focus; that link isn't established. ## How does activity improve blood flow to the brain? Exercise training changes blood flow in some parts of the brain. Scans showed consistent increases in the hippocampus and one other area, but not across the whole brain [9]. A single session of mild-to-moderate aerobic exercise could raise brain blood flow, while very hard exercise led to a decline [4]. You don't need to push very hard. Whether a lasting rise in blood flow leads to better thinking isn't yet established [4]. ## Can activity improve focus and concentration? The picture is mixed. A single bout of exercise has been followed by faster information processing [4]. Short, regular breaks from sitting, such as a brisk walk every 30 minutes, are tentatively suggested to help short-term attention [10]. In adults over 50, the benefit of regular exercise was consistent across the thinking skills tested [3]. How big any effect on focus is remains unclear. ## What simple activities boost everyday brain function? Any movement counts. The WHO says health benefits occur below the recommended amounts, and that replacing sitting with activity of any intensity, including light, has benefits [2]. Even light exercise may give a worthwhile thinking benefit [1]. Walking, gardening, housework and carrying shopping all count, and there are chair-based options if mobility is limited [11]. Several short bouts of 10 or 15 minutes can be easier than one long session [12]. Aim for moderate effort: breathing a little harder, but still able to talk, not sing. > **Try this:** This week, choose one everyday activity, such as a walk or some gardening, and do it for 10 minutes on three days. ## Does strength training help your brain? Probably, for some aspects of thinking. Resistance training improved overall thinking scores and executive function, but not working memory, and results varied widely [13]. In adults over 50, aerobic exercise, resistance training, multicomponent training and tai chi all showed benefits for thinking [3]. For general health, the WHO recommends muscle-strengthening on 2 or more days a week [2]. Build up gradually. ## How does aerobic exercise change brain structure? The best-supported change is protection rather than growth: aerobic exercise appeared to prevent the loss of hippocampus volume that happens over time [14]. Scans of overall brain structure in people are mixed. Some showed more grey and white matter, while one found no difference in brain volume after a year of exercise [5]. Nothing shows that these changes explain better thinking. ## How does physical health affect brain health? Heart and blood-vessel health is linked with brain health, but the link is an association, not proof of cause. Even light physical activity has been linked with better brain health, and more sitting with poorer thinking performance [15]. Staying active and sitting less are sensible steps, but they aren't a guarantee. ## Can exercise help with brain fog? Exercise can't be promised to clear brain fog. Talk to a doctor if brain fog is frequent, gets in the way of work or daily activities, or is getting worse [16]. Memory problems don't necessarily mean dementia; they can have other causes, such as depression, anxiety or side effects of some medicines [17]. Don't try to work out the cause yourself, and don't treat exercise as a substitute for getting persistent memory problems checked. ## Does exercise change the brain (for example, hippocampus growth)? Mostly in animals. Growth of the hippocampus after aerobic exercise has been consistently seen in animals, but the human findings are equivocal [14]. The clearest human signal is protective: exercise appeared to slow the usual loss of volume rather than make the hippocampus bigger [14]. Some people's scans show other changes in grey and white matter, but not consistently [5]. ## How is cardiovascular fitness linked to thinking skills? The link is not straightforward. In older people without known memory problems, aerobic exercise improved fitness, but the fitness gain did not coincide with better thinking [18]. So don't use your fitness level as a measure of your brain, and keep activity for the many other benefits it brings. ## Do diet and exercise affect inflammation in the brain? Exercise may reduce inflammation in the body, which is one possible explanation for its thinking benefits, not a proven one [1]. In people with mild cognitive impairment, exercise had a certain effect on lowering inflammation markers in the blood [19]. These are blood markers, not measures of inflammation in the brain. Whether diet changes brain inflammation isn't clear yet. ## When to check with a health professional If you're starting exercise after a long break, it's always a good idea to see your doctor first. For an injury or a health condition, see a health professional, such as your doctor or a physio. Don't exercise when you're unwell. If you feel breathless, dizzy, light-headed or have palpitations while exercising, stop, sit down and rest, and see a doctor if it persists [11]. Muscle soreness a day or two later is normal; for a sore muscle or joint, ease off and see a doctor if it lasts. Call your local emergency number for chest pain or pressure (or pain spreading to the arm, neck, jaw or back, especially with sweating or feeling sick), severe breathlessness, fainting or collapse, signs of a stroke, a serious injury, or someone who isn't safe. ## Quick answers ### Is walking enough to help my brain? Walking counts. The WHO says some physical activity is better than none, and activity of any length counts. Brisk walking, where you can talk but not sing, is a good moderate effort. How much walking best supports thinking isn't clear yet, so choose a routine you can keep up and build from there. ### Does it matter how hard I exercise for my brain? Moderate effort is a good aim: breathing harder, but still able to talk. Benefits have been linked with at least moderate effort, and light activity may help too. Very hard exercise isn't clearly better. Pick a level you can repeat, and build up gradually. ### How long does it take for exercise to help my memory? There's no clear timeline. Programmes of three months or less did better than programmes running beyond six months, so you don't need a long programme to get started. The size of any benefit varies from person to person, so think of it as something that tends to come with regular activity, not a quick fix. ### Do I need to exercise every day to see a benefit for my thinking? No fixed number is clear. Some gains in planning and similar skills were linked with three or more sessions a week, while the benefit for general thinking didn't differ much by how often people exercised. Regular matters more than perfect. Activity of any length counts, and a missed day is not a setback. ## Sources 1. Singh B et al. (2025). Effectiveness of exercise for improving cognition, memory and executive function: a systematic umbrella review and meta-meta-analysis. British Journal of Sports Medicine. https://doi.org/10.1136/bjsports-2024-108589 2. Bull FC et al. (2020). World Health Organization 2020 guidelines on physical activity and sedentary behaviour. British Journal of Sports Medicine. https://doi.org/10.1136/bjsports-2020-102955 3. Northey JM et al. (2018). Exercise interventions for cognitive function in adults older than 50: a systematic review with meta-analysis. British Journal of Sports Medicine. https://doi.org/10.1136/bjsports-2016-096587 4. Renke MB et al. (2022). A Systematic Review of the Impact of Physical Exercise-Induced Increased Resting Cerebral Blood Flow on Cognitive Functions. Frontiers in Aging Neuroscience. https://pmc.ncbi.nlm.nih.gov/articles/PMC8882971/ 5. Fernandes MSS et al. (2020). Effects of Physical Exercise on Neuroplasticity and Brain Function: A Systematic Review in Human and Animal Studies. Neural Plasticity. https://doi.org/10.1155/2020/8856621 6. Chen W et al. (2026). Effects of exercise on executive function in cognitively healthy older adults: a systematic review and three-level meta-analysis. BMC Public Health. https://pmc.ncbi.nlm.nih.gov/articles/PMC13227755/ 7. Gholami F et al. (2025). Exercise training alters resting brain-derived neurotrophic factor concentration in older adults: A systematic review with meta-analysis of randomized-controlled trials. Experimental Gerontology. https://doi.org/10.1016/j.exger.2024.112658 8. Titus J et al. (2021). The role of physical exercise in modulating peripheral inflammatory and neurotrophic biomarkers in older adults: A systematic review and meta-analysis. Mechanisms of Ageing and Development. https://doi.org/10.1016/j.mad.2021.111431 9. Kleinloog JPD et al. (2023). Effects of Physical Exercise Training on Cerebral Blood Flow Measurements: A Systematic Review of Human Intervention Studies. International Journal of Sport Nutrition and Exercise Metabolism. https://doi.org/10.1123/ijsnem.2022-0085 10. Chueh TY et al. (2022). Acute effect of breaking up prolonged sitting on cognition: a systematic review. BMJ Open. https://pmc.ncbi.nlm.nih.gov/articles/PMC8928248/ 11. NHS. Exercise safely with CVD. My Health London. https://www.myhealthlondon.nhs.uk/be-healthier/move-more/exercise-safely-with-cvd/ 12. NHS. Cardiac rehabilitation home exercise guidelines. Cambridge University Hospitals. https://www.cuh.nhs.uk/patient-information/cardiac-rehabilitation-home-exercise-guidelines/ 13. Landrigan JF et al. (2020). Lifting cognition: a meta-analysis of effects of resistance exercise on cognition. Psychological Research. https://doi.org/10.1007/s00426-019-01145-x 14. Firth J et al. (2018). Effect of aerobic exercise on hippocampal volume in humans: A systematic review and meta-analysis. NeuroImage. https://doi.org/10.1016/j.neuroimage.2017.11.007 15. Hassani S, Gorelick PB (2024). What have observational studies taught us about brain health? An exploration of select cardiovascular risks and cognitive function. Cerebral Circulation - Cognition and Behavior. https://pmc.ncbi.nlm.nih.gov/articles/PMC11414496/ 16. Healthdirect Australia (2026). Brain fog - symptoms, causes and treatment. https://www.healthdirect.gov.au/brain-fog 17. NHS. How to get a dementia diagnosis. https://www.nhs.uk/conditions/dementia/symptoms-and-diagnosis/diagnosis/ 18. Young J et al. (2015). Aerobic exercise to improve cognitive function in older people without known cognitive impairment. The Cochrane Database of Systematic Reviews. https://pmc.ncbi.nlm.nih.gov/articles/PMC10554155/ 19. Ma C et al. (2022). The impact of physical activity on blood inflammatory cytokines and neuroprotective factors in individuals with mild cognitive impairment: a systematic review and meta-analysis of randomized-controlled trials. Aging Clinical and Experimental Research. https://doi.org/10.1007/s40520-021-02069-6 --- Source: Twikka (https://twikka.com/learn/brain-health-memory-and-focus). General information about physical activity, not medical advice.