Endurance

Endurance determines how many HP you have, and how quickly you regain those hitpoints.
Each point of endurance adds a few hit points to the torso; and a smaller number of hit points to the head, groin, and each limb [provided they are natural, i.e. made of human flesh].
The player character *must* be generated with 10 Endurance points [which results in 37 hit points]; making it the only attribute that will have a constant value for each player rather than a random number between 7 and 13. However, Endurance can be decreased to 9 or lower ingame by eg contaminated fountain water.

Training

Endurance increases naturally by naturally healing a lot of hit points lost over time [particularly if you survive an explosion without fire protection and heal your wounds].
Eating Ommel Snot also increases your endurance.
Eating School Food also has a chance to increase your endurance ["You get a toughness point for surviving this stuff"].

Abusing

Having leprosy for prolonged periods of time or vomitting a lot seem to occasionally lower Endurance ["You feel less healthy"].

Items

Wearing a body armor of great health will increase endurance, with each +bonus in AV also resulting in a +1 bonus to Endurance