In Japan, pedometers are so popular that most households there now have several. While pedometers have not yet reached this level of popularity in the United States, the media commonly discuss monitoring physical activity with pedometers. This discussion has focused both on its use as a monitoring device and as a means of physical activity motivation. With the inactivity of youths and adults raising concerns among health and fitness professionals, these professionals often ask questions about the validity and reliability of pedometers and the best ways to use them. This article, therefore, provides answers to teachers and health professionals' frequently asked questions about pedometers.