Researchers over the world have investigated the relationship between field dependence-independence and sport-related settings (sports selection, sports performance, motor learning, and physical education) for almost 50 years. Field-dependent (FD) individuals, compared with field-independent (FI) individuals, are constantly found to demonstrate less advantage and poorer performance in these sport-related settings. As a result, concerns arise that FD adolescents might also experience lower level of physical activity, which could result in a higher risk of developing obesity and related diseases, than their FI counterpart. This book provides new research results supporting the concern. Specifically, compared with FI adolescents, FD adolescents have a significantly lower level of physical activity, are much less likely to participate in organized sports, and tend to engage in physical activities that are less related to sports, thus expending less energy. The book adds new findings to the body of knowledge and is useful to professionals in the field of adolescents' physical activity promotion and intervention.