The actor is known for his muscled look, but not that many people actually know the effort it costs him. Everyone who has watched him train believes that Grillo works out at 200%. They say Grillo trains like a beast. He goes to the gym as early as 5:30 a.m. and spends six days a week there. Frank was taught to fight by his father. In the 2nd grade, the boy wanted to fight back against a school bully who was harassing him, and his dad taught him how to throw a punch. Nowadays the actor prefers boxing. Grillo follows paleo diet. This diet allows only foods that cavemen could eat. That is why cereals are absent from Frank's diet. Every day the actor allows himself a glass of red wine. He is sure that this habit helps him to keep in shape. Grillo has several tattoos on his body. Mostly his tattoos are ritual images that have to do with one religion or another – Buddhism, Judaism, Catholicism. One of Grillo's biggest passions is riding a motorcycle. Every week Frank rides it to the mountains.