Our body's built-in reward system, driven by the chemical dopamine, tells us to do the things that give us pleasure: Creative energy, falling in love, entrepreneurship — even the continued procreation of the human race — are all driven by this system.
Unfortunately, so is the urge to overeat.
A pedometer senses your body motion and counts your footsteps. This count is converted into distance by knowing the length of your usual stride. Wearing a pedometer and recording your daily steps and distance is a great motivating tool