# Immunity, lungs, digestion and inflammation > Regular moderate activity is linked to better immune defence, and structured exercise programmes ease breathlessness in people with COPD. Gentle movement may also ease constipation. Start with walking at a pace where you can still talk, and build up gradually. - Type: Guide - Topic: Evidence & Guidelines › Health Benefits of Activity - Reviewed by: Andrew Schox, BSc(Hons) PGradDipPod MPod, Podiatrist (2026-10-21) - URL: https://twikka.com/learn/immunity-lungs-digestion-and-inflammation - Updated: 2026-10-21 - **Regular moderate activity is linked to better immune defence** and a stronger response to vaccination [1]. - **Exercise may ease cold symptoms,** but it did not reduce how many colds adults caught [2]. - **For COPD, structured exercise programmes ease breathlessness and fatigue** and improve walking distance [3]. - **Everyday movement such as walking or housework may help constipation** [4]. - **Any amount of activity counts.** No proven "anti-inflammatory dose" exists, so aim for regular, comfortable activity [5]. ## Does regular exercise strengthen the immune system? Regular moderate activity is linked to better immune defence and a stronger response to vaccination, but it isn't a simple "boost" [1]. The clearer benefit is in how illness plays out. Exercise did not reduce how many colds adults caught, but it eased how bad symptoms were and cut the number of days with symptoms by about 2.24 days over the follow-up period [2]. These results rest on few trials, so treat them as promising rather than certain. The moderate activity tested most often was walking, cycling or treadmill work, usually at least three times a week for 30 to 45 minutes [2]. The 150 minutes a week of moderate to vigorous activity recommended for preventing chronic disease also appears protective against infectious disease [1]. No harm was found from doing more, up to moderate to vigorous levels (60 to 600 minutes a week) [1]. Very long or very intense sessions are linked to signs of weaker immune defence, mainly seen in athletes, so there is no need to push hard [6]. No best amount, type or frequency has been shown, so choose something you can keep doing. > **Try this:** Three times this week, go for a walk at a pace where you can talk but not sing. Start with as many minutes as feel comfortable, and add a few minutes each week. ## How does exercise help lung health? The strongest benefits are seen in people with COPD. Pulmonary rehabilitation (a structured programme of exercise and education) eases breathlessness and fatigue, improves emotional wellbeing and gives people a stronger sense of control over their condition. The improvements are moderately large [3]. Walking distance also improves compared with usual care, and programmes with at least four weeks of exercise training are strongly supported as part of COPD treatment [3]. In asthma, these programmes probably improve walking distance and quality of life, but they have little effect on asthma control [7]. For otherwise healthy inactive adults, how much exercise helps the lungs isn't clear yet. What to do: - **If you have COPD or asthma,** ask your doctor whether a pulmonary rehabilitation programme is available near you. - **Choose activities that make you breathe a little quicker and deeper,** such as brisk walking. NHS advice is to try aerobic activity at least twice a week, and strengthening activities at least twice a week to help manage breathlessness [8]. - **Build up gradually** so your breathing stays comfortable. ## Does physical activity help digestion? Activity probably helps digestion, mainly by easing constipation, but this isn't certain. People who meet activity guidelines tend to have less constipation, but that link weakened once other factors such as weight, age, alcohol, smoking and fibre intake were taken into account [9]. In people who already had constipation, aerobic activity such as walking or Qigong was linked with improvement, though the true size of the effect can't be pinned down [10]. NHS advice is that exercise stimulates the bowel to work, which leads to easier bowel emptying. It doesn't have to be hard: everyday movement such as walking or housework will help [4]. What to do: - **Start with gentle everyday activity.** Walking or housework is a reasonable place to begin. - **Little and often is fine.** You don't need hard exercise for this. ## Can regular exercise reduce chronic inflammation? Possibly, but what we know is mostly about how exercise might work, and about indirect markers, rather than clear measured results in inactive adults. Being inactive leads to fat building up around the organs and switches on inflammatory pathways. Long-lasting inflammation is linked to several diseases associated with inactivity [11]. Regular exercise may protect against these diseases partly through an anti-inflammatory effect, possibly by reducing that fat or by creating an anti-inflammatory environment in the body with each session [11]. Which types, intensities and durations of exercise work best isn't clear yet [11]. That means there is no proven "anti-inflammatory dose". Aim for regular, comfortable activity that you can keep up. The WHO guideline says benefits come from doing any amount of physical activity, at all ages and abilities [5]. You can build up gradually. ## 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. If you have a lung condition, check with your doctor before starting. Stop and see a doctor if you have a fall, a muscle strain or a flare-up of your condition during exercise. 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. Soreness a day or two after a harder session is normal. For a sore muscle or joint, ease off. If it persists or gets worse, see a doctor or other health professional. Breathlessness or dizziness that doesn't settle, or feeling unwell or sweaty during or after activity, needs the emergency advice above, not just rest; if it has settled, see a doctor soon. Unusual tiredness should be checked by a doctor. Regular tummy pain, ongoing discomfort or bloating, a lasting change in bowel habit, or blood in the stools should be checked by a doctor rather than treated with exercise alone. Exercise is not a substitute for medicines or treatment you've been prescribed. Keep following your doctor's advice about them. ## Quick answers ### Can exercise help me breathe more easily on the stairs? It may. Regular movement strengthens the muscles around your lungs and the rest of your body, so breathing tends to get easier during activity. Choose activities that make you breathe a little quicker and deeper, such as brisk walking, build up gradually, and add some muscle-strengthening on other days. ### Can exercise help irritable bowel syndrome? In adults with irritable bowel syndrome, reported symptoms improved after physical activity, but the certainty of this is very low. Quality of life did not clearly improve. If you have ongoing tummy pain or bloating, see a doctor rather than relying on exercise alone. ### How long does it take for exercise to reduce inflammation? That isn't clear yet, and no proven amount or type of activity has been shown to lower inflammation. A sensible approach is regular, comfortable activity that you can keep doing. Any amount counts, and you can build up how often, how hard and how long over time. ## Sources 1. Chastin SFM et al. (2021). Effects of Regular Physical Activity on the Immune System, Vaccination and Risk of Community-Acquired Infectious Disease in the General Population: Systematic Review and Meta-Analysis. Sports Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC8056368/ 2. Grande AJ et al. (2020). Exercise versus no exercise for the occurrence, severity, and duration of acute respiratory infections. The Cochrane Database of Systematic Reviews. https://pmc.ncbi.nlm.nih.gov/articles/PMC7127736/ 3. McCarthy B et al. (2015). Pulmonary rehabilitation for chronic obstructive pulmonary disease. The Cochrane Database of Systematic Reviews. https://pmc.ncbi.nlm.nih.gov/articles/PMC10008021/ 4. NHS. Improving bowel function and control. https://www.gloshospitals.nhs.uk/your-visit/patient-information-leaflets/improving-bowel-function-and-control/ 5. 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 6. Drummond LR et al. (2022). Acute and chronic effects of physical exercise on IgA and IgG levels and susceptibility to upper respiratory tract infections: a systematic review and meta-analysis. Pflugers Archiv. https://pmc.ncbi.nlm.nih.gov/articles/PMC9574171/ 7. Osadnik CR et al. (2022). Pulmonary rehabilitation versus usual care for adults with asthma. The Cochrane Database of Systematic Reviews. https://pmc.ncbi.nlm.nih.gov/articles/PMC9394585/ 8. NHS. My keep active handbook. https://www.esht.nhs.uk/wp-content/uploads/2026/04/My-keep-active-handbook.pdf 9. Cui J et al. (2024). Physical activity and constipation: A systematic review of cohort studies. Journal of Global Health. https://pmc.ncbi.nlm.nih.gov/articles/PMC11583288/ 10. Gao R et al. (2019). Exercise therapy in patients with constipation: a systematic review and meta-analysis of randomized controlled trials. Scandinavian Journal of Gastroenterology. https://doi.org/10.1080/00365521.2019.1568544 11. Gleeson M et al. (2011). The anti-inflammatory effects of exercise: mechanisms and implications for the prevention and treatment of disease. Nature Reviews Immunology. https://doi.org/10.1038/nri3041 --- Source: Twikka (https://twikka.com/learn/immunity-lungs-digestion-and-inflammation). General information about physical activity, not medical advice.