Four-time Olympic gold medalist Michael Johnson is recovering after suffering a ministroke last week.
In a series of tweets posted on Saturday, Johnson announced he is back at home with his family:
"Last week I rather surprisingly suffered what's known as a Transient Ischemic Attack or mini stroke. 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.
"It seems these things can affect anyone, even the once fastest man in the world!