How small towns breed Olympic athletes

As London becomes the latest big metropolitan city hosts the Olympic Summer Games, many of the athletes competing come from small towns all over the world.

US Olympians like swimmer Nathalie Coughlin, marathon runner Ryan Hall, and hockey player Lauren Crandall all come from towns with a population of less than 10,000.

A study by Jean Cote of Queen's University in Ontario, Canada showed that a majority of professional American football players came from small towns, even though 80% of Americans lived in bigger cities.

The BBC's Franz Strasser went to Jonesboro, Arkansas, where former Olympic pole vaulter Earl Bell trains current Olympians like Jeremy Scott.

The trainer talks about why small towns are better equipped to raise an athlete.