Americans are stereotypical for getting enough to eat, and working out was less of a luxury than a way of life for a people that consumed steak and cheeseburgers in the local family buffet. Now, being muscular is expensive—you still get easier access to protein in the US compared to Europe, but young Chinese men these days, they’re all tall, they work out (well, many of them).
Physical health is the most important thing in society, one should not live in a country that doesn’t promote their individual health, growth, strength and power. It seems at least the CCP has prioritized this, at least as far as the notoriously unbiased South China Morning Post reports.