Plain answerRead the series in this order: The ADHD Hunter, The ADHD Runner, The ADHD Gameplan, The ADHD Soul, and The ADHD Rulebook. That preserves the narrative arc. Start elsewhere when one book answers your immediate question better.
Book 1: The ADHD Hunter
The field origin and central reframe. See who it fits.
Book 2: The ADHD Runner
Movement, focus, endurance, and the adult-beginner experience. Read the evidence boundary.
Book 3: The ADHD Gameplan
External structure built after collapse and reset. Enter the applied system.
Book 4: The ADHD Soul
The broadest and most speculative thought experiment. See where theory begins.
Book 5: The ADHD Rulebook
Thirty direct rules and a legitimate fast entry into the series. Choose the practical route.