It depends on your definition of hardworking kids
About 30 million kids does sports in America.
Only about 40 percent of American children play sports. This number reflects the huge number of children in in the United States that are obese.
America Undercover - 1986 Kids in Sports The Price of Glory was released on: USA: 10 September 1986
2% in america. 3% in europe.
I'd say 5,000,000 because America loves them and even kids outside of America love them.