People who exercise to extreme levels and appear healthy on the outside can, in fact, be quite unhealthy on the inside.

Hogan, whose real name was Terry Gene Bollea, died July 24 of acute myocardial infarction, commonly known as a heart attack, according to a copy of Hogan's cremation report obtained by ABC News through the Pinellas County Forensic Science Center.

CLEARWATER, Fla. (AP) — Professional wrestler Hulk Hogan died of a heart attack last week, according to a Florida medical examiner’s report released Thursday. Hogan, whose real name was Terry Bollea, previously had leukemia and atrial fibrillation, an irregular heart rhythm, the report from the District Six Medical Examiner said.