Less than 24 hours to go until Britain celebrates the one year anniversary of the 2012 Olympic games. But recent news reports of doping in athletics is becoming the big headline.

Usain Bolt attended a press conference ahead of this weekend's Diamond League meeting in London to celebrate one year after the 30th edition of the Olympic games.

The 26 year-old has unforgettable memories at the Olympic stadium in London.

The Jamaican won three gold medals at last summer's Olympics. Bolt was faster than his training partner, Yohan Blake in both the 100m and 200m. Bolt and Blake worked together to retain gold in the 4 x 100m relay for their country.

The six time Olympic champion will be looking forward to seeing his fans from Britain once again and hopes to relive the glory 12 months ago.

With recent headlines of high-profile athletes like Tyson Gay, Asafa Powell and Sherone Simpson all failing drug tests, journalists used the opportunity of asking the fastest man in the world.

"I'm clean," said Bolt.

"You have to be careful as an athlete on what you do and what you ingest."

Bolt also pointed to his success as a junior as an indicator of his ability, rather than any illegal methods to enhance his performance. 

"I have been doing phenomenal things since I was 15. I was the youngest person to win the world juniors at 15. I hold the world junior record at 19.93," he told the packed press conference.

"I've broken every record there is. In every event I have ever done, for me I have proven myself since the age of 15."

The 5-time world athletics champion is focusing on next month's world championships in Moscow knowing that his gold medal rival Yohan Blake is ruled out due to injury. Of course the likes of Powell and Gay are also out due to failed drug tests.

"I still have the world championships ahead of me," said Bolt. "Everybody is stepping up their game. So, I have to really focus on that."

Bolt will be hoping to have the 100m world championships medal around his neck for the first time in 4 years after being disqualified in the 2011 world final because of a false start in Daegu.


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