https://www.auckland.ac.nz/en/news/2018/12/07/new-zealand-rated-globally-for-children-s-activity-levels.html
https://www.stuff.co.nz/life-style/well-good/116616459/child-obesity-nz-second-worst-in-oecd-39-per-cent-of-kids-overweight-or-obese
Re New Zealand above: I’m afraid NZ is actually pretty appalling for childhood obesity, and physical activities are ranked poorly as well.
The image of countries like NZ is “clean and green/sports,” but these kinds of cultural preoccupations don’t actually seem to correlate very well with national fitness levels. NZ cities still, to a large extent, are full of one-storey bungalow sprawl (though there have been some attempts to densify cities in the last 10 years or so, with some success). As a result, most people are extremely car dependent and there is little walking. In general, fitness levels at the population level correlate far better with urban layouts/transportation modes than with self-conscious “sports/gym” type initiatives; exercise works best in practice when it is incidental and part of people’s lives.
As for the UK, many people talk with both sides of their mouths. Nearly all people, if you ask them, will say things like “Oooh yes, we should be getting more exercise as part of our daily routine! I wish my lifestyle let me get exercise and walking throughout the day!”
But then, an article comes up on a village in France or Spain that banished its cars to the outskirts and made the interior of the village more-or-less car-free. Cue horror from the majority of commentators: “What if you have to bring shopping in from your car?” “What if you have children with you, or a baby?” “What if it’s raining?” “What if it’s hot?” “What about in winter?”
And I’m like….. Soooooo….. you want a lifestyle with built-in, incidental exercise, BUT you don’t want to be forced to move if you have to push a trolley/carry a rucksack, manage a child at the same time, or be in less than 100% ideal weather/temperature. You realize that that cancels out most incidental day-to-day exercise, right? Getting exercise as part of one’s day to day live inherently involves developing some resilience about the fact that you might have to carry/push things, deal with kids or cope with some heat or cold sometimes.