If my son works out everyday and he's only 12 will he stunt his growth?

Define workout. The content of a workout varies.The aap and various sports medicine organizations encourage waiting for such programs as power lifting or heavy weight training until a child reaches sexual maturity (their final height).Cardio training & weight or resistance training that is focused on technique is ok in younger kids. Supervision by certified trainers is encouraged to avoid injury, .
Working out. Tell him not to lift weight over his head ie no squats. Also do not push up overhead while string or standing. These maneuvers compress the spine and theoretically may inhibit linear growth.