Janet, age 11, had just started cheering practice and had done some light stretching/warm-ups. The girls were jogging a lap around the football field when Janet told her friend that she was tired and was going to lay down. She went into cardiac arrest and was resuscitated on the field by a pediatric trauma nurse. Janet’s heart stopped several times en route to the hospital. CPR was administered in the ambulance, and Janet was alive and conscious upon arrival to the hospital. She spoke with her parents and was coherent and stable. Her parents were told that Janet would be OK. A short time later, she went into cardiac arrest and could not be revived. Janet’s physical two months earlier had not detected any problems.