Sedentary behaviours include activities at the lowest spectrum of energy expenditure such as lying down, sitting, watching television, using the computer and other media and screen-based past times. A habitual sedentary lifestyle has been associated with different health problems. This important book gathers current research from across the globe in the study and prevalence of physical inactivity, and evaluates the numerous health risks associated with sedentary behaviour. Some topics discussed herein include how a sedentary lifestyle can impact cognitive ability adversely; sedentary behaviours and cardiovascular risk factors for children and adolescents; childhood obesity prevention and management; exercise training; and, the effects of sedentary behaviour on mood and insulin sensitivity.