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.

Obesity rates in youth have tripled over the past 20 years. Physical activity aids in weight loss and is critical for weight maintenance. Further, physical activity has other physiological and psychological benefits. Obese youth often see specialists for weight loss treatment. Treatment in a pediatric population uses a multi-component approach, but physical activity if often overlooked. Combining physical activity information with physician care and nutritional information could improve weight loss and the overall health of these obese children.

Inclusion Criteria:

• 12 to 18 years old
• attending the ECU Pediatric Comprehensive Healthy Weight Clinic

Exclusion Criteria:

• must be able to read and write in English
• must be able to participate in physical activity