What does 'DNF' mean in race results?
AnswerDid not finish
DNF marks a runner who started a race but did not reach the finish line.
Fitness · Facts & stats
50K facts & stats
7 fact-checked facts about 50K ultramarathons, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
In trail and ultra races, what is an aid station?
AnswerA checkpoint with water and food for runners
Aid stations along the course let runners refill water and eat during long races.
Going deeper
The marathon recalls a legendary messenger who ran from Marathon to which city?
AnswerAthens
Legend says a messenger ran from the battlefield at Marathon to Athens to announce victory.
What do endurance runners call sudden severe fatigue when carbohydrate stores run very low?
AnswerHitting the wall
'Hitting the wall' describes the slump when glycogen stores are largely used up.
What is 'tapering' before a big race?
AnswerReducing training load in the final days or weeks
A taper cuts training volume before a race so the body arrives rested.
Expert level
Which Olympic event covering 50 kilometres was last held at the Tokyo 2020 Games?
AnswerThe men's race walk
The men's 50 km race walk was first held in 1932 and was dropped from the programme after Tokyo 2020.
The marathon's 42.195 km distance was based on the course of which Olympic Games?
AnswerLondon 1908
The 1908 London course set 26 miles 385 yards, adopted as the standard distance in 1921.
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