Michael Johnson Mini Stroke

Four-time Olympic champion Michael Johnson says he is recovering at home after suffering a "mini-stroke".

The American, 50, once the fastest man in the world at 200m and 400m, tweeted that he had a "transient ischemic attack" last week.

"The good news is I'm back at home with my family, cleared of any heart issues and have already made great progress on my road to a full recovery," he added.

Johnson, a BBC Sport pundit, also won eight World Championship golds.