30 binary mental models designed to cut noise and help you decide better, faster.
Each chapter is 2–4 pages. Each follows the same pattern: Equation, Story, Antithesis (when to flip), Decision Filters, and Practice prompts.
You can read it cover-to-cover in one sitting, or jump to the chapter you need right now. Readable in an evening. Built to be used the next morning.
Each equation includes context, stories, and when to flip it.
Reading 30 equations is one thing. Using them daily is another. Mental Gym gives you a 5-minute daily workout to apply one equation to real decisions.
Get the Daily WorksheetPre-order the book and get instant access to the Cheat Sheet and Discussion Guide for teams.