Look back on Mighty Mo's career
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He's one of Great Britain's greatest athletes but all good things must come to end and after a career filled with medals and world records, Mo Farah is saying good-bye to the track.
Mo only has a couple of races left and his last major event is at the World Athletics Championships in London.
So Jenny has been having a look back over the years of Mo's career - from his arrival in England in 1991 to his first major gold in 2011.
Check out the video!