Telephone Physical Activity Intervention in Obese Youth

The purpose of this study is to examine the effectiveness of a telephone-based physical activity (PA) intervention in obese adolescents attending a Health Weight Comprehensive Clinic. Secondary aims focus on increasing the amount of change in obesity markers, namely waist circumference and BMI z-scores. The investigators hypothesize the following: 1.The telephone-based PA intervention will increase PA levels above the mail group; and 2. The telephone-based PA intervention will provide changes in waist circumference and BMI z-scores above the mail group.