Spend less time focusing on "discipline," and more time in things that genuinely pull you forward...
The person who requires internal force, will always get lapped by someone with genuine drive toward that thing.
Obsession beats discipline all day long.
After years of floundering, I think I'm finally getting it: You get energy by spending it. The fuel tank metaphor is completely misleading. The body supplies energy to meet demand. The tank *expands* if you use a lot of fuel. In other words, biology is fundamentally antifragile