Trifling Turtle

Hello, folks! I have the intention to run a particular gimmick with a character soon which will be centered around the idea that following certain beliefs will result in greater power. Now, all that will be my own problem to brainstorm later, but the primary question I have is regarding exactly how can such a promise be fulfilled? I don't doubt there are many roads to Rome on this one, but what methods exist to permanently increase someone's aether? Outside training for years, of course. I am looking for methods that can be applied to anyone, or just about anyone. Legality of methods is also a non-issue. Merely looking for the knowledge of how to go about it for now. Also, as a side note, regarding aether and physical capacity, are the two connected? While physical training and muscle building clearly plays a part in a person's strength, it appears to me that increasing someone's aether also boosts their power overall. Is this the case or am I mistaken?