Concept
20-Mile March
2 books in the library reach for this idea - each in its own way. When independent authors converge on one concept, it usually deserves attention.
Great by Choice
How this book uses it: A specific performance target hit consistently regardless of conditions. Define yours and never violate it.
The Comfort Crisis
How this book uses it: Consistent daily effort regardless of conditions - build habits that work whether you feel like it or not.
