Exercise for brain health

Why exercise matters for the brain

Physical activity influences brain health through several pathways: it improves cerebral blood flow, reduces inflammation, stimulates production of brain-derived neurotrophic factor (BDNF), supports hippocampal volume, and controls vascular risk factors that themselves drive dementia (blood pressure, blood glucose, lipids, sleep, weight, mood).

Across observational studies and randomised trials, the benefits are reliable: people who meet the UK Chief Medical Officers' weekly activity guideline have meaningfully slower cognitive decline, better mood, fewer falls and a lower incidence of dementia.

The UK target, in plain terms

The UK Chief Medical Officers' physical activity guidelines (2019, with updates) recommend, for all adults including older adults:

• At least 150 minutes per week of moderate-intensity activity, or 75 minutes of vigorous activity, or an equivalent combination;
• Two sessions per week of muscle-strengthening activity;
• For older adults: activities to improve balance and flexibility on at least two days a week;
• Reduce sedentary time wherever possible.

Moderate intensity means you can talk but cannot easily sing. Brisk walking, gardening, cycling on the flat, swimming, and dancing all qualify.

Starting from where you are

The biggest gains come from going from inactive to lightly active. Even ten minutes of walking a day, three days a week, is associated with measurable health benefit. Build from there.

Week 1 to 4

• Three brisk 15-minute walks per week;
• One short session of chair-based or standing balance work, 5 to 10 minutes;
• Two short bouts of getting up from a chair without using hands, 8 to 10 repetitions.

Week 5 to 8

• Four brisk 20-minute walks per week, ideally outdoors for daylight exposure;
• One longer balance session (10 to 15 minutes), including heel-to-toe walking and single-leg stance with support;
• One session of resistance work using bands or light weights.

Week 9 to 12

• Reach 150 minutes of moderate activity per week (for example, five 30-minute brisk walks);
• Two short resistance sessions covering legs, back, chest and arms;
• Daily 5 to 10 minutes of balance work.

Aerobic activity in detail

Aerobic activity is the most studied component. Across randomised trials, 150 to 180 minutes per week of moderate-intensity aerobic activity, sustained over 6 to 12 months, is associated with measurable improvements in attention, executive function and memory.

Practical options:

• Brisk walking, ideally with a route or pedometer target;
• Nordic walking with poles, which adds upper-body work and improves balance;
• Cycling, including stationary cycling at home, which is well tolerated when joints are an issue;
• Swimming and aqua aerobics, particularly good when balance or pain limits walking;
• Dancing classes (line dancing, ballroom, ceilidh), which add cognitive engagement to the aerobic element.

Strength and resistance training

Muscle mass and strength decline naturally with age (sarcopenia). Resistance training counters this, preserves balance, reduces falls and supports independence. UK guidance is two sessions per week, covering the main muscle groups.

Two simple home-based sessions:

Session A: lower body

• Sit-to-stand from a chair, 2 sets of 10 repetitions;
• Calf raises while holding the worktop, 2 sets of 12;
• Step-ups onto a low step, 2 sets of 10 each side;
• Wall squats, hold for 20 seconds, 3 sets.

Session B: upper body

• Wall push-ups, 2 sets of 10;
• Resistance band rows, 2 sets of 12;
• Light dumbbell shoulder press, 2 sets of 10;
• Bicep curls with light dumbbells, 2 sets of 12.

NHS resources, the Royal Osteoporosis Society and Age UK each offer well-illustrated home strength programmes for older adults.

Balance and falls prevention

Falls are a leading cause of injury and loss of independence in older adults, including those with dementia. Balance training reduces fall rates by roughly a third when done consistently. Evidence-based programmes include FaME (Falls Management Exercise) and the Otago programme, both available in many UK areas through community classes.

Simple daily balance work at home:

• Stand on one leg next to a worktop for 10 to 30 seconds, alternating;
• Heel-to-toe walking along a corridor;
• Reach to the side and behind safely with support;
• Tai chi and yoga classes (community or online).

Exercise with dementia

The benefits extend across the disease trajectory:

• In MCI, exercise is associated with the most reliable slowing of progression.
• In mild and moderate dementia, structured exercise improves mood, sleep, behaviour and functional capacity.
• In severe dementia, gentle range-of-motion and seated activity supports comfort and prevents complications.

Practical tips for carers: short sessions, familiar music, a regular time and place, and a focus on enjoyment rather than performance.

Safety and pre-exercise screening

Most older adults, including those with cognitive impairment, can safely increase physical activity. Discuss with your GP first if you have:

• Recent chest pain or breathlessness;
• Unstable heart conditions or recent stroke;
• Significant balance impairment or recent falls;
• Severe joint problems limiting movement;
• Newly prescribed medicines affecting heart rate or blood pressure.

If you have not been active for a long time, start with 5 to 10 minutes and build gradually. Hydrate. Wear well-fitting shoes.

Tracking and motivation

Simple tracking helps. A pedometer, a kitchen calendar with ticks, or a basic smartphone step counter all work. Aiming for at least 7,000 steps a day, or one 30-minute brisk walk plus normal activity, is realistic for most people.

Group activity (a walking group, a class, a friend) is associated with better adherence than solo exercise. Alzheimer's Society and Age UK list local activities. Many memory cafes include gentle exercise.

How exercise links with the rest of the care plan

Exercise sits alongside vascular risk reduction, diet, sleep and social engagement. Together these constitute the most powerful set of interventions available outside medication.