How much outdoor time does a child actually need?

The short answer is well-defined: the World Health Organization recommends an average of 60 minutes per day of moderate-to-vigorous physical activity for children and adolescents 5-17, plus "limited sedentary time" for the under-fives (WHO, Guidelines on Physical Activity and Sedentary Behaviour, 2020).

The longer answer is more useful, because that 60-minute number lands very differently across ages.

By age, in plain words

Under 1. The WHO recommends "interactive floor-based play, several times a day". No screens. No structured exercise. Tummy time.

1 to 4. At least 180 minutes of physical activity per day, of which 60 should be moderate-to-vigorous by age 4. This sounds like a lot. In practice, a normal toddler running around a park hits this without anyone counting.

5 to 17. An average of 60 minutes per day of moderate-to-vigorous activity, mostly aerobic, across the week. Plus muscle- and bone-strengthening activity at least 3 days per week. Plus a cap on sedentary screen time.

For a deeper read on what "moderate-to-vigorous" actually feels like and how to count it without becoming weird about it, this article walks through it.

The "outdoor" bit specifically

The WHO numbers don't differentiate indoor from outdoor activity. The nature-deficit literature does: time outside in green space adds attention restoration and stress reduction on top of the cardiovascular benefit (Engemann et al., PNAS, 2019). The practical implication, summarised in our piece on nature deficit: prefer outdoor when you can pick.

A modest weekly target that combines them: most days, hit the WHO 60 with at least half outdoors; once a week, a full afternoon outside.

What gets in the way

Two things, in order of how-much-they-actually-matter:

1. The structure of the afternoon. A heavily-scheduled child has fewer chances at the unstructured slot where outdoor play tends to happen. The streetlights rule is the structural fix.
2. Screens at the moment of choice. A kid who has the iPad at 4pm doesn't go to the park at 4pm. The mechanism is well-studied.

A reasonable plan

• Walk to and from school if at all possible.
• One outdoor block of at least 30 minutes most weekdays. Anything counts: the lunchtime playground, the walk to a friend's house, riding a bike around the block.
• One full Saturday or Sunday afternoon outside.
• No screens in the bedroom at night.

That's it. The rest is noise.