Michael Johnson had a distinguished career in track and field where he won 4 Olympic Gold medals and 8 World Championships and still holds the 400m world record of 43.18 seconds. He has been the only one to win both the 400m and the 200m at the same Olympics.

Since retiring from the track in 2000, Johnson has continued to develop sports business opportunities as well as acting as an athletics pundit and been involved in charitable sports ventures such as the Laureus programme.

Passion For Sport reporter Norman Brierley asked Mr Johnson what was the most significant part of his illustrious career so far and asked him if progress was being made on the issue of drug abuse in the sport.