The ranking is based on data collected from 23.2 million Fitbit users across the globe. The analysis is a representative sample of 2016 data from more than 10 million users in the United States and at least 10 thousand users in each international country.
Ireland was ranked as the fittest country in the world, followed by the UK, Sweden, the Netherlands and Switzerland.
The FitBit data does not track fitness of the population as a whole, only those who subscribe to certain type of lifestyle.
Notably, South Africa was ranked 29th, just under the United States – both of which are considered to also be the countries with some of the worst obesity rates in the world, according to the WHO.
See more detail at https://businesstech.co.za/news/general/178381/south-africa-among-the-fittest-countries-in-the-world/ 
South Africa among the fittest countries in the world
Sports and fitness tracker FitBit has released its list of the fittest countries in the world for 2017, ranking 65 countries according to their level of fitness and healthy habits, including South Africans.