Some of you might think I'm a noob to ask this question but recently an idea aroused in my mind. How does internal power cultivate and decrease? Is internal power the energy or is it different and separate?
Example: H7G and OYF fight at Mt. Hua for a whole day. Did they use up all their internal power and will need to re-cultivate it all back OR will they gain it all back in a day of rest?