Due to the increasing prevalence of childhood obesity and overweight, health problems may begin to appear at an early age. The aim of this study is to examine physical activity level, core performance, anthropometric measurements and peak expiratory flow in overweight and obese adolescents compared to normal weight adolescents.

Due to the increasing prevalence of childhood obesity and overweight, health problems may begin to appear at an early age. Overweight and obese people are at risk for medical conditions that can lead to greater morbidity and mortality. Lack of physical activity is a well-known risk factor for obesity and the relationship between them has been supported by many studies. It has also been reported by studies that obesity affects respiratory parameters. In overweight and obese adolescents, a relationship is likely between the affected respiratory parameters and the weakened core region. There are not enough studies on this subject in the literature. Therefore, the aim of the study is to examine the physical activity level, core performance, anthropometric measurements and peak expiratory flow in overweight and obese adolescents in comparison with normal weight adolescents.

• Inclusion Criteria for the Obese and Overweight Group:
• BMI percentile value is 85.-95. between and above the 95th,
• Do not have any chronic disease,
• Do not have orthopedic problems that would prevent them from participating in the study,
• Secondary school students who are willing to participate in the study and whose parents' consent has been obtained will be included.
• Inclusion Criteria for the Normal Weight Group:
• BMI percentile value is 5th-85th. between,
• Do not have any chronic disease,
• Having no orthopedic and neurological problems that would prevent them from participating in the study,
• Secondary school students who are willing to participate in the study and whose parents' consent has been obtained will be included.
• Exclusion Criteria:
• BMI percentile value below the 5th,
• With chronic cardiac and pulmonary disease,
• Having a diagnosis of neurological or other disease affecting cognitive functions,
• Individuals receiving medical treatment that will affect attention and concentration will not be included.

The study will consist of 60 volunteer adolescents who are obese, overweight and normal weight studying in the 5th, 6th and 7th grades of secondary school.