'Farah is not invincible' - Butchart

Scotland's Andrew Butchart has been training at GB Athletics' elite high-altitude camp in Flagstaff, Arizona alongside quadruple Olympic champion Sir Mo Farah. Butchart ran shoulder-to-shoulder with Farah before finishing 6th in the 5000m at the Rio Olympics but believes he can take Farah on at the World Championships in London in August.

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