The activation energy mental model originates from chemistry, referring to the minimum energy required to initiate a chemical reaction. When extended to everyday life, it represents the initial push or threshold needed to start a task or make a change—essentially, overcoming inertia. Often, beginning a new task or making a significant change demands a disproportionately large effort upfront, while maintaining momentum afterward requires far less energy. Understanding activation energy helps us recognize that the obstacle is often not a lack of ability, but rather the difficulty in overcoming initial resistance. By lowering the barrier to entry or introducing "catalysts," we can more effectively prompt action, overcome procrastination and inertia, and achieve our goals.