Mo Farah has denied allegations that he is a drugs cheat ahead of his participation in the half-marathon Great North Run this Sunday.
The double Olympic and World gold medallist says he is hurt by the claims that his scintillating form is a result of doping, insisting it is all down to hard work over many years.
“I know I’m clean and that’s what you need to know," said the 30-year-old, speaking whilst high-altitude training in the French Pyrenees.
"I work hard at what I do and what I have achieved is down to hard work and big sacrifices.
“That’s why it hurts [when people doubt me]. If I was cheating why would I need to be away from my family and up in the mountains doing all this stuff?”
Farah won both the 5000m and 10,000m golds at London 2012 and then repeated the feat at last month's World Championships in Moscow, cementing his position as being considered amongst the long-distance running's all-time greats.
And Farah is insistent that there is evidence that shows he is clean.
“They take a blood sample and keep it and if the profile changes in future it shows up and you get caught,” he said.
“Britain has the best system by far. I wish other countries would follow how we do things.
“It is disappointing that some people let down others by choices they make, but I’ve worked hard for many years and if you look at my career progression I’ve not had a spike anywhere, I’ve consistently progressed.”
Farah's participation in the Great North Run is part of the Somalian-born runner's transition from track racing to road racing that will include him participating in next April's London marathon.
The race - run every year from Newcastle to South Shields - will also feature the likes of Ethiopian legends Kenenisa Bekele and Haile Gebrselassie.
“In our career we shouldn’t be afraid to try things,” said Farah.
“I’m that sort of a person. The London Marathon is something I dreamed of and I want to test myself before it’s too late.
“This is a once in a lifetime opportunity for me to race against these guys [in the Great North Run].
“I wouldn’t be running if they weren’t coming.
“In terms of what we’ve all achieved, you couldn’t get a bigger line-up.”
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