The case for DNF — an ultramarathon runner on what she learned by not finishing a race

Among readers, there are two main camps: the completionists, who'll battle through every boring chapter even if they're absolutely hating it, and those who DNF (do not finish).

The DNFers argue life is just too short to waste time on a book that doesn't spark joy.

But it can be much harder to walk away from a goal that's taken years of effort, or feels intrinsically tied to your identity.

Endurance runner Jane Davies recently wrote about her DNF experience, pulling out of a 100km race more than halfway through.

When you've embarked on a huge challenge that requires immense preparation and hard work, how do you make the decision that it's time to quit?