Various levels of physical activity participation are associated with health benefits and/or health risks. As a result, it is important that we have valid tools for assessing physical activity at various ages. This becomes particularly important with longitudinal research, which might span a number of years. The Physical Activity Questionnaire for Older Children (PAQ-C) and the Physical Activity Questionnaire for Adolescents (PAQ-A) provide a general measure of physical activity for youth from grades 4-12 (approximately ages 8-20). The purpose of the PAQ manual is to ensure that you can easily administer the PAQ measures in research and to provide you with a library of studies utilizing the PAQ-C and the PAQ-A.