Subjects:~Sample size estimation will be carried out to determine the recruited number of children selected randomly from both governmental and private primary and preparatory schools at El Mansoura educational administration, Dakahlia Governorate and Damietta governorate to participate in this study. The survey targets the normal students from both sexes.~They will be selected based on the following:~Inclusion criteria:~All children will be age ranges from 10 to 12 years~The BMI <95th percentile (WHO, 2007)~Smartphone addiction scale short version will be used to categorize the children to addicted group (score > 32) (Kwon et al., 2013) .~They will be cooperative and followed the instructions.~Exclusive criteria:~Children will be excluded from the study if they have:~Neurological diseases.~Respiratory disorders.~Congenital deformities.~Vision disorders not corrected by glasses.~Children who participate in competitive sports.~Obesity.
Statement of the problem:~Are there relations between smartphone addiction, neck posture, pulmonary functions and functional capacity in children? Null hypothesis~It will be assumed that:~There will be no effect of smart phone addiction on head posture, pulmonary function and functional capacity in children.~There will be no relation between smartphone addiction, head posture, pulmonary function and functional capacity in children.