According to the WHO guidelines, children and adolescents aged 5–17 years should do at least: (a) 30 minutes o

Concept understanding — Physical Activity Guidelines

Physical Activity Guidelines are not a set of rigid rules you must follow, like a school timetable. Instead, think of them as a minimum recommended dose of movement for your body, much like a doctor prescribes a minimum dose of medicine for an illness. Just as your body needs food and sleep, it needs a certain amount of physical activity to function well and stay healthy.

The core idea is that health is not just the absence of disease; it is a state of complete physical, mental, and social well-being. Physical activity is a direct, powerful tool to build and maintain that well-being. The Guidelines are the evidence-based prescription for how much activity is needed to get those benefits.

The precise meaning is this: Physical Activity Guidelines are official, science-backed recommendations on the type, intensity, duration, frequency, and total amount of physical activity that different population groups (children, adults, older adults, pregnant women, people with chronic conditions) should do to achieve significant health benefits and reduce the risk of chronic diseases.

Why does this matter? Because inactivity is a major risk factor for many lifestyle diseases. The Guidelines give you a clear, achievable target. They are not about becoming an athlete; they are about preventing the slow, silent damage of a sedentary life.

Here is the core framework you need to know, broken down into the key components:

Aerobic Activity (Cardio): This is rhythmic, continuous movement that makes your heart beat faster and your lungs work harder. Examples include brisk walking, cycling, swimming, or dancing. The key measure here is intensity (how hard you are working) and duration (how long you do it).
Muscle-Strengthening Activity: This involves working your muscles against resistance to build strength, power, and endurance. Examples include lifting weights, using resistance bands, push-ups, squats, or heavy gardening. The key measure here is frequency (how many days a week) and the number of repetitions.
Bone-Strengthening Activity: This involves impact or tension that stimulates bone growth. It is especially critical for children and adolescents. Examples include running, jumping rope, basketball, and weightlifting.

Important

The single most important takeaway is that some activity is better than none, and more activity (up to a point) provides greater health benefits. The Guidelines are a floor, not a ceiling. Even small amounts of movement, like a 10-minute walk, count toward your total. The goal is to break up long periods of sitting and build a habit of regular movement.

For a typical adult, the general recommendation is to aim for at least 150 minutes of moderate-intensity aerobic activity (or 75 minutes of vigorous-intensity) spread across the week, combined with muscle-strengthening activities on two or more days per week that work all major muscle groups.

The Guidelines are not a one-size-fits-all prescription. They are a framework. A 60-year-old with arthritis will have a different starting point than a 20-year-old athlete. The key is to understand the principles and then adapt them to your own life, your own body, and your own goals. The ultimate purpose is to empower you to take control of your own health through the simple, powerful act of moving your body.

(b) 60 minutes of moderate-to-vigorous physical activity per day.

For 5–17-year-olds the guideline is at least 60 minutes of moderate-to-vigorous activity daily, mostly aerobic — plus vigorous activity and muscle/bone-strengthening work on at least 3 days a week. The 150-minutes-a-week figure in option (c) is the adult guideline.

The guideline, age band by age band

Important

Age group	Recommendation
Infants (under 1 year)	Physically active several times a day; at least 30 minutes of tummy time spread through the day for those not yet mobile
Children & adolescents (5–17 years)	At least 60 minutes of moderate-to-vigorous physical activity daily, mostly aerobic; vigorous activity and muscle- and bone-strengthening on at least 3 days a week
Adults (18–64 years)	150–300 minutes of moderate aerobic activity per week (or 75–150 minutes vigorous); muscle-strengthening on 2 or more days a week
Older adults (65+)	As for adults, plus varied multicomponent activity emphasising balance and strength on 3 or more days a week to prevent falls

Reading the table across, the shape of the question becomes obvious: the exam is checking whether you can keep the children's row separate from the adults' row. Three of the four options are either an adult figure, a halved figure, or an invented one.

What "moderate-to-vigorous" actually means

Moderate — the child is breathing harder and warming up, but can still hold a conversation: brisk walking, cycling on the level, playing catch.
Vigorous — breathing is hard and talking comes in short phrases: running, football, swimming laps, skipping.

The 60 minutes need not be one unbroken block. They accumulate through the day — the PE period, a games session, the cycle to school, and an hour of play in the evening all add into the daily total. This is what makes the guideline realistic for a school-going child.

Why the muscle- and bone-strengthening clause matters

Childhood and adolescence are the years in which peak bone mass is laid down. Weight-bearing, impact activity — running, jumping, skipping, climbing — is the stimulus bone responds to. That is why the guideline does not stop at "60 minutes of aerobic work" but adds strengthening activity on 3 or more days a week. Aerobic work alone builds the heart and lungs; it does not, by itself, build strong bone.

Refuting the other options

(a) 30 minutes per day — exactly half the requirement. Thirty minutes is a common minimum starting point people quote for sedentary adults; it is not the children's standard.
(c) 150 minutes of moderate activity per week — this is the adult (18–64) figure. Note how far short it falls for a child: 60 minutes a day is 420 minutes a week, nearly three times as much. Children need more, not less.
(d) 180 minutes of light activity per day — no age band in the guideline prescribes this. Two things are wrong: the intensity (children need moderate-to-vigorous, not light) and the number itself.

Tip

If you can remember just two numbers into the exam hall, remember 60 a day for children and 150 a week for adults. Most MCQs in this chapter are built by swapping those two around.

✓Final answer

The correct option is (b) — 60 minutes of moderate-to-vigorous physical activity per day . Children and adolescents 5-17 years : at least 60 minutes of moderate-to-vigorous physical activity daily, mostly aerobic. Plus vigorous activity and muscle- and bone-strengthening activity on at least 3 days a week — the stimulus for peak bone mass. The 60 minutes can be accumulated across the day, not necessarily in one block. (a) 30 min/day is half the prescribed dose. (c) 150 min/week is the adult (18-64) guideline. (d) 180 min/day of light activity matches no age band, and the intensity is wrong — children need moderate-to-vigorous .

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Q.According to the WHO guidelines, children and adolescents aged 5–17 years should do at least:

The guideline, age band by age band

What "moderate-to-vigorous" actually means

Why the muscle- and bone-strengthening clause matters

Refuting the other options

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