How much exercise do adults need?
Adults should aim for 150 to 300 minutes of moderate aerobic activity a week, or 75 to 150 minutes of vigorous activity, together with strength exercises on at least two days. Brisk walking, cycling and swimming can contribute. If you are starting from very little activity, shorter sessions are useful while you build up step by step.
The weekly activity targets
The World Health Organization's guideline for adults aged 18 to 64 is the one HPB uses in Singapore. It asks for 150 to 300 minutes of moderate-intensity aerobic activity a week, or 75 to 150 minutes of vigorous-intensity activity, or a mix of the two. On top of that, it asks for muscle-strengthening activity on two or more days a week.
The recommended range provides substantial health benefits, but activity below it is still useful. Benefits can continue above 300 moderate-intensity minutes a week. The suitable amount depends on health, fitness, recovery and the activities involved.
Spread across a week, 150 minutes is 30 minutes on five days, or around 22 minutes every day. It can also be three sessions of 50 minutes. It does not matter how you arrange the minutes. There is no longer a requirement for activity to last at least ten minutes to count. Short bouts of moderate or vigorous activity contribute to the weekly target; lighter movement is also beneficial, above all as a break from sitting.
The guideline gives adults aged 65 and above the same aerobic and strength targets, with one addition. It asks for activity that improves balance on three or more days a week, because falls are the main injury risk in that age group.
How to judge your exercise intensity
The words moderate and vigorous describe effort, and effort depends on the person. A brisk walk is moderate for a fit thirty-year-old and may be vigorous for someone who has not exercised in years. The easiest way to judge the level is by breathing and speech.
- Light activity is anything that makes little change to breathing. Strolling through a mall, standing at a counter and light housework sit here. It is good for the body, but it does not count towards the weekly minutes.
- Moderate activity makes your breathing noticeably faster and your body warmer. You can still speak in full sentences, but not sing. Brisk walking, cycling on the flat, swimming at an easy pace and badminton doubles are typical examples.
- Vigorous activity makes breathing hard and deep. You can say only a few words before you need a breath. Jogging, fast cycling, football, singles badminton and stair climbing at pace sit here.
One minute of vigorous activity counts for about two minutes of moderate. The guideline sets the vigorous range at half the moderate range for this reason. A person who jogs for 25 minutes three times a week has met the target through vigorous activity alone.
Why strength and balance also matter
Muscle-strengthening activity is a separate part of the weekly guideline. Include it even if you already do a lot of walking, cycling or swimming.
Strength work means making the major muscle groups work against a load until they are tired. The load can be body weight, a resistance band, a pair of dumbbells, a gym machine or a bag of groceries. Squats, lunges, push-ups against a wall or the floor, step-ups on a staircase and rows with a band all qualify. A session can be 15 to 20 minutes.
Muscle strength supports the joints, protects bone, and is the main thing that keeps a person able to stand from a chair without using their hands at eighty. It does not require a membership. ActiveSG gyms are inexpensive, and the fitness corners under HDB blocks have pull-up bars and step benches that are empty most of the time.
Older adults can include balance exercises such as supported single-leg standing or heel-to-toe walking, using a stable support and a safe space. A supervised class is useful if balance is poor. Avoid combining an unfamiliar balance exercise with another task that could distract you.
Fitting activity into a working week
The target looks large when you picture it as gym sessions. It looks smaller when you build it from the movement that already happens between home and work. A plausible week for an office worker might look like this.
- The MRT commute usually includes a walk at each end. Ten minutes to the station and ten minutes from the station, at a brisk pace, is 20 minutes a day and 100 minutes across a working week.
- Stairs instead of the escalator at the station and the office are short bursts of vigorous effort. Three flights, several times a day, add up and count double.
- The lunch walk to a hawker centre two streets away rather than the nearest one adds 10 to 15 minutes at a decent pace.
- The park connector on a weekend morning, before the heat, gives 45 to 60 minutes of walking or cycling in one go.
- Two short strength sessions at home, in the evening, cover the second half of the guideline.
Added up, that week clears 150 minutes without a single session you would call a workout. Heat is the main obstacle. Early morning and after seven in the evening are the workable windows for anything outdoors, and shopping malls and underground links offer air-conditioned walking for the middle of the day.
HPB's National Steps Challenge and the Healthy 365 app exist for people who like a target to chase. They are optional. You meet the guideline through the movement itself, whether or not you record it.
Starting with manageable amounts
The largest relative gains often occur when people move from very little activity to some activity. This supports starting with manageable amounts, even if the recommended weekly total feels out of reach at first.
That shape matters for anyone starting from zero. Ten minutes of walking a day can be a useful first step for someone who has been inactive. Choose a duration and pace you can tolerate, then build over time. Recovery from illness, disability or other health needs may call for a tailored plan.
The same shape also shows that the target is not a maximum. Going beyond 300 minutes of moderate activity is safe for most healthy adults, and the benefits continue, though at a smaller rate. The guideline sets the range where the return on time is highest.
Anyone with a heart condition, uncontrolled blood pressure, diabetes on medication or a recent operation should check with their doctor before starting anything vigorous. Anyone who has not exercised for years should build up over weeks rather than days, because the muscles and tendons take longer to adapt than the lungs.
Planning your next week of activity
The weekly guideline of 150 to 300 minutes of moderate activity, plus two days of strength work, is the target for a healthy adult. It is reachable in Singapore through walking, stairs, a park connector morning and two short home sessions, without a gym.
Choose a short walk or another accessible activity and keep repeating it. Add basic strength exercises at a manageable level as part of the plan; there is no need to wait a fixed month before including them.
Anyone with a medical condition, a doctor's restriction or symptoms such as chest pain or dizziness on exertion should talk to their doctor or polyclinic before increasing activity.
A practical next step
Count your moderate and vigorous activity across the week, and make room for strength work on two days. Start at a level you can manage and increase it a little at a time; the full target need not be your first-week target.
Sources and further reading
These references explain the guidance and research discussed above. For advice about your own health, speak to a qualified healthcare professional.
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