Stamina

A measure of a character's endurance, Stamina measures their capacity for physical activity. Running and fighting can use up a character's Stamina quickly, but Stamina points are also quickly recovered. Unlike Health and Mana, Stamina increases very little over time.

Unless modified by a power, Stamina recovery is a constant which is independant of race, class, Constitution, total Stamina, or any other statistic. It is three times faster while sitting than standing, however.