Tour de France champion Chris Froome is undergoing physiological tests in attempt to prove that he is riding clean.
The Team Sky rider has fielded plenty of questions about the nature of his performances in a sport reeling from the legacy of the Lance Armstrong era.
The 2013 and 2015 champion released a short video of the tests on his Twitter account and said he "will be sharing results later in the year!"
Kicking off physiological testing at @GSK_HPL today 😅 pic.twitter.com/IANEDj3W6i
— Chris Froome (@chrisfroome) August 17, 2015
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