Endurance represents being worn down by physical activity. The rate at which your endurance recovers is determined by race and the level of your miniskill called Fitness. Anyone with an ox tattoo can regain endurance more quickly merely by touching the tattoo once it is inked.
Certain artefacts can reduce the cost of endurance, such as the Sash of Eternal Battle while others increase its regeneration, such as a ring of endurance or a torpous paragon.