Activity, Adiposity, and Appetite in Adolescents 2 Intervention

Inclusion Criteria: * Tanner Stage III-V, as determined via self-assessment * Non-smoking * Not currently involved in any other research study * No meds that may alter metabolism * Sedentary (\<60 min/day exercise) * Willing to participate in an exercise program Exclusion Criteria: * BMI \<5th percentile or \>99th percentile for age and sex * Weight not stable * Restrained eater (\>13 on the restraint section of the three-factor eating questionnaire; Current/past diagnosis of an eating disorder. * Self-reported medical conditions (including, but not limited to, diabetes, Crohn's disease, etc.) that may affect adherence to the protocol, exercising safely, or alter metabolism * Taking medications know to affect metabolism (e.g. thyroid medication, β-blockers, or stimulants). * Gave birth in the past 12 months or \<6 months post-lactation. * Active (\>60 min/day exercise) * Not willing to participate in an exercise program