A warrior on and off the track, Allyson Felix is determined to go out on her own terms as she sets out on the final leg of her glittering career at the World Championships this week.
After 16 years at the pinnacle of her sport, the 33-year-old American has accumulated more World Championship and Olympic honours than any other track and field athlete in history.
In Doha, she will be aiming to add to an incredible collection of 25 medals, a dazzling haul that includes six Olympic golds and 11 World Championship titles.
The Worlds mark the start of what is in all probability a year-long lap of honour, with Felix eyeing a golden farewell at what will be her fifth Olympic Games in Tokyo next year.
Unusually for Felix, Doha marks the first time that she will not be entered in an individual event at a major championships after she failed to finish in the top three at the US trials in July.
Instead, Felix will travel as part of the US relay pool as the Americans look to defend the 4x400m title they won in London.
