Indoor recess is hurting your kid's afternoon.

A growing number of primary schools, in the UK, the US and parts of the EU, have moved towards "indoor recess" on rainy or cold days. The intention is humane: dry kids, supervised behaviour, less mess. The unintended consequence, on the school-day-attention literature, is fairly bleak.

A 2009 study in Pediatrics (Barros et al.) followed 11,000 American 8- and 9-year-olds and found that children who had at least one daily 15-minute outdoor break performed measurably better on teacher-rated classroom behaviour than children who had no break or only an indoor break. Children with no daily outdoor break were over-represented among children flagged for behavioural concerns.

A 2015 follow-up by Ramstetter et al. (Journal of School Health) reviewed 53 studies and concluded, in unusually direct language, that recess "should be considered a fundamental part of the school day".

The mechanism

The break works on attention, not on energy. The specific thing that gets restored is "directed attention", the cognitive resource that lets a child sit through a maths lesson without their mind drifting. Directed attention is depleted by sustained classroom focus and replenished by either sleep or unstructured outdoor time. Indoor recess replenishes neither, because it isn't unstructured (most schools run loosely-supervised indoor games) and isn't outdoor (the nature signal is what does the heavy lifting; see this piece).

The closest analogue in the office-worker literature is the lunchtime outdoor walk, which produces the same restorative effect in adults (Faber Taylor & Kuo, 2009).

What you can do at home

You don't run the school. You do run the after-school hour. Two interventions, in order of impact:

1. First 30 minutes after school: outside. No screen, no homework. A walk, a kick-about, a bike. Half of the WHO daily target can be hit in this slot alone, and it doubles as the directed-attention recovery the indoor recess didn't deliver.
2. The walk home itself, if at all possible. The one-mile test explains why this is one of the highest-leverage parenting decisions you can make.

What to ask the school

If you are involved in your child's school: ask about the recess policy in detail. The questions that matter are: do children get an outdoor break every day they're at school? How long is it? What is the wet-weather policy? Are children kept in for behaviour management?

A school that answers "yes, 25 minutes, light rain doesn't cancel, no" is doing well by the data. A school that answers "weather permitting, supervised, sometimes" deserves a follow-up question.