In Greek, “Apnea” means “Without air” and free-diving is called “Apnea”. Free-diving is similar to snorkeling, but divers need to hold their breath if they go in deep water. Free-diving doesn't need tools for breathing. Free-divers hold their breath until going up to the surface of the sea instead of using an air tank. Therefore, the most important part of free-diving is learning to breathe well. Most people can free-dive since it doesn’t need a snorkel or scuba tank. However, free-divers condition their mind and body before going free-diving.