A pedometer is a device that counts each step a person takes by detecting the motion of the person's hips. Used originally by sports and physical fitness enthusiasts, pedometers are now becoming popular as an everyday exercise measurer and motivator. Often worn on the belt and kept on all day, it can record how many steps the wearer has walked that day, and thus the kilometres or miles (distance = number of steps × step length). Step counters can give encouragement to compete with oneself in getting fit and losing weight. A total of 10,000 steps per day, equivalent to 8 kilometres (5.0 mi), is recommended by some to be the benchmark for an active lifestyle, although this point is debated among experts. Step counters are being integrated into an increasing number of portable consumer electronic devices but which one to choose?