Since the 1970s, several Asian countries, such as China, Japan, and South Korea, have strongly increased their influence in the Olympic movement.
Instead of showcasing a rising global power with a booming economy, the 2014 Games put a spotlight on Brazil's most serious economic recession since the 1930s, along with a host of social problems.
In sports, what's considered fair play has changed throughout history. At one point, even looking 'too poor' was grounds for exclusion.
A former Olympic gold medalist reflects on his own financial struggles as he trained and competed for the 1984 Games. Decades later, not much has changed for many Olympians.