While receiving radiation treatment for a thyroid illness, I had refused to take beta-blockers – a medication that would have eased its side effects – because they were deemed illegal by the sport’s governing body, the International Association of Athletics Federations.

I dont have a thyroid anymore. I had radioactive iodine treatment, which destroyed my thyroid. I take medication every day.

I have to be cautious, have my thyroid levels checked, and as long as I do that, I’m fine.