A pedometer, or step-counter, is a device, usually portable and electronic or electromechanical, that counts each step a person takes by detecting the motion of the person's hands or hips. Because the distance of each person's step varies, an informal calibration, performed by the user, is required if presentation of the distance covered in a unit of length is desired, though there are now pedometers that use electronics and software to determine how a person's step varies automatically. Distance traveled can be measured directly by a GPS receiver.
A digital Omron HJ-112 pedometer
Mechanical pedometer
Historical pedometer, Southern Germany, 1590
Nike+iPod Sports Kit
Walking is one of the main gaits of terrestrial locomotion among legged animals. Walking is typically slower than running and other gaits. Walking is defined by an "inverted pendulum" gait in which the body vaults over the stiff limb or limbs with each step. This applies regardless of the usable number of limbs—even arthropods, with six, eight, or more limbs, walk. In humans, walking has health benefits including improved mental health and reduced risk of cardiovascular disease and death.
Computer simulation of a human walk cycle. In this model the head keeps the same level at all times, whereas the hip follows a sine curve.
Racewalkers at the World Cup Trials in 1987
Nordic walkers
Free heels are a defining characteristic of ski touring