Walking is the primary exercise in this protocol. Not the gym. Not running. Walking.

The reason is practical. When you are in a calorie deficit, your energy is limited. Intense workouts require fuel you do not have, motivation you have to manufacture from scratch, and recovery days that set you back. Walking requires none of that. You put on shoes and leave the house.

A 90-minute walk at a moderate pace burns roughly 400 to 500 calories depending on your weight. Add that to a 1,000-calorie daily food deficit and you are burning nearly 1,500 calories more than you consume. Two consistent walking days in a row with clean eating can produce about half a kilogram of actual loss. Those are real numbers, not projections.

Walking is also your safety buffer. A calorie deficit has margin for error: a slightly bigger portion, a forgotten tablespoon of oil, an extra snack. The walk absorbs those mistakes and protects the deficit. Without it, your margin shrinks to almost nothing and every bite has to count exactly. That is an exhausting way to live for months.

There is an additional effect after the first extended fast. When your body is fat-adapted, running primarily on fat rather than , you can walk for two, three, even four hours without hunger. stores are low and is elevated. The days right after a fast are the highest-leverage walking days in the entire protocol. Walking in that window burns more fat per hour than almost any other form of exercise.

The app tracks your walking sessions. Start a walk, set a duration, and see the calorie burn against your daily target. Over weeks, the walking log becomes a record of your actual output, and on the days the scale is not moving, that record is often the only honest indicator of whether you are doing the work.