What are good workout and meal plan tips for a 15 year old?

Depends: Glad to hear you are working with your teen! Workout and meal planning depends on what the starting point is. You would want to start with a lighter exercise program if your teen is not used to exercise. Whatever you choose try to keep all in the family involved with meal planning and family exercise time. I like this site as a good starting point: http://kidshealth.org/teen/