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There is the argument that essentially the entire difference between Jesse Owens running 10.2 in 1936 and Bolt running 9.58 in 2009 can be accounted for based on improvements in track surface and sprinters spikes.
I can't say for sure that Bolt is clean, but his career actually looks a lot like that of a clean athlete. He has been well known since the age of 15, and his athletic progression follows how you would expect a once in a generation talent to progress. His sprinting form is considered to be the picture perfect form that all sprinters should aspire to, and his height provides him with a longer stride length than any other elite sprinter can run. Simply he is a freak of nature who has perfected his art.
Can you expand on the bolded? I follow the distance runners more than the sprinters, but Galen Rupp has been well known since at least 16 and is tied to potential doping.
I also have no idea of Bolt is clean or not, but from the history of the sport it would not surprise me if he was not clean. Actually, I'd probably be more surprised if he was clean.