The US has the highest gym membership in the world… (and the highest rate of obesity)

There is a direct relation between the rate of gym membership and the rate of obesity. The higher the number of people who go to the gym, the higher the number of people who are obese.

Sources:

https://www.statista.com/statistics/252933/leading-markets-of-the-health-club-industry-worldwide-by-number-of-members/

http://apps.who.int/bmi/index.jsp

https://en.wikipedia.org/wiki/List_of_countries_and_territories_by_population_density