Worldwide there has been a large shift towards less physically demanding work and a more sedentary lifestyle. This has been accompanied by increasing use of mechanized transportation, automobile dependency, a greater prevalence of labor saving technology in the home, and less active recreational pursuits. At least 31% of the world's population does not get sufficient physical exercise. This is true in almost all developed and developing countries, and among children. Some experts refer to sitting as "the new smoking" because of its negative effects on overall health. These exercise trends are contributing to the rising rates of chronic long-lasting diseases such as: obesity, heart disease, stroke, preventable causes of death, cardiovascular disease, high blood pressure and high cholesterol. Active transport (walking, bicycling, etc.) has been found to be inversely related to obesity in Europe, North America, and Australia. Thus exercise has been associated with a decrease in mortality. Causes of lack of exercise One of the causes most prevalent in the developing world is urbanization. As more of the population moves to cities, population over-crowding, increased poverty, increased levels of crime, high-volumes of car traffic, low air quality and lack of parks, sidewalks and recreational sports facilities leads to a less active lifestyle. Physical inactivity is increasing or high among many groups in the population including: young people, women, and the elderly. A 2005 population study in south Brazil showed physical inactivity during leisure time to be more prevalent among females and those living with a partner; with a positive correlation associated with age and number of cigarettes smoked, and a negative correlation (decreased levels of physical inactivity) associated with years of formal education, body mass index, and increasing socioeconomic status. Studies in children and adults have found an association between the number of hours of television watched and the prevalence of obesity. A 2008 meta analysis found that 63 of 73 studies (86%) showed an increased rate of childhood obesity with increased media exposure, and rates increasing proportionally to time spent watching television. Another cause in the case of children is that physical activity in activities from self-propelled student transport, physical education, and organized sports is declining in many countries. Symptoms Noncommunicable diseases, partly due to a lack of exercise, are currently the greatest public health problem in most countries around the world. Each year at least 1.9 million people die as a result of physical inactivity, which makes