The document proposes a smartphone app called "The Bread Challenge" that promotes physical activity and donations to fight hunger. The app would track a user's daily steps, calories burned, or other activity to fill a "loaf progress bar". Once a full loaf is earned, it means the daily target is reached and a donation is made to the UN World Food Programme. The goal is to motivate people in wealthy countries to get more active for a good cause by gamifying physical activity as "earning bread", while also providing food to those in need.