apeman

a system i use is to wait until I'm almost beat and then say "I will carry on for at least another X seconds"

as skier says, you can often take different amounts of pain depending on your expectations. Fatigue is also quite dependant on psychological factors. At the end of the day, being able to do something like run a mile needs both physical fitness and a certain amount of belief.

Lots of people stop running after a certain distance and say "I can't go any further!" when what they mean is "It's starting to hurt now" - I know I do ...

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pain is inevitable but misery is optional - stick a geranium in your hat and be happy