What is meant by the 29th Olympied? How many Olympics have been played?

Question

What is Michael Phelps listening to? What do the colors mean on the Olympic symbol?

Answer 1

29 olympics.

It's pretty self explanatory.  

Answer 2

Multiply  4x29 and  take that product  and  subtract it  from 2008

...that is when they were first recorded

An Olympiad is every 4 years, therefore 29 Olympics  games  have been held

Answer 3

29 times there have been Olympic games in the MODERN Olympics, which began in 1859.

The original or "ancient" Olympic Games started in Greece, in about 776 BC and were celebrated until about 393 AD.