Glyphscape/Vitality

Vitality is the most simple skill in RS3. It determines the amount of life you have - each level up increases your hit points by 4%. You start off with 0 exp, effectively at level 0, and will gain a level within two minutes no matter what you do. At level 0, you maximum hit points is 100.

You can improve vitality merely by being logged in - at the rate of 1 exp per second. This is true no matter the specific situation you're in.

You can also speed up the rate at which you gain vitality experience.