Efficacy Trial of Healthy Together ("Juntos")

Inclusion Criteria: Adolescent 1. Lives with participating biological parent or legal guardian; 2. Self-identifies as Hispanic; 3. Is between the ages of 12-15years old; 4. Has access to a smartphone; 5. Does not meet recommendations for physical activity as determined by a validated 2-item screener; 6. Does not meet recommendations for daily fruit and vegetable intake (proxy for diet quality) as determined by a validated 2-item screener; 7. Exceeds recommendations for screen time (proxy for sedentary behavior) as determined by a validated 6-item screener Parent 1. Is the biological parent or legal guardian of and lives with the adolescent; 2. Self-identifies as Hispanic; 3. Has access to a smartphone; Exclusion Criteria: Adolescent 1. Has BMI \<5th (underweight) or ≥95th percentile (obesity); 2. Has a parent-reported chronic medical condition (e.g., type 2 diabetes) that requires more intensive intervention; 3. Has parent-reported responses on a physical activity readiness questionnaire (PAR-Q) that indicates a serious health issue, and a physician does not approve participation; 4. Has a parent-reported cognitive or developmental delay (e.g., Down Syndrome) that may interfere with understanding program materials. Parent 1. Provides PAR-Q responses that indicate a serious health issue and a physician does not approve participation; 2. Reports family plans to move out of South Florida during the study follow-up period