Some articles on pedometer, pedometers:

... A pedometer is a device, usually portable and electronic or electromechanical, that counts each step a person takes by detecting the motion of the person's hips ... covered in a unit of length (such as in kilometres or miles) is desired, though there are now pedometers that use electronics and software to automatically determine how a person's step varies ... Used originally by sports and physical fitness enthusiasts, pedometers are now becoming popular as an everyday exercise measurer and motivator ...