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The ancient Olympic Games (Olympia Games) were a series of competitions in which representatives from various city-states of ancient Greece gathered to compete. Athletic events were the main focus, but combat sports and chariot races were also held. Defeat could sometimes result in death.[2] The origins of the ancient Olympics remain shrouded in mystery.[3] A well-known myth holds that Heracles and his father Zeus were the founders of the Olympics.[4][5][6] According to legend, Heracles was the first to call the competition the "Olympic Games" and established the tradition of holding them every four years.[7] Another legend states that Heracles built the Olympic stadium to honor Zeus after completing his Twelve Labors. Upon its completion, he walked 200 steps in a straight line, a distance later termed a stadion (Greek: στάδιον → Latin: stadium), which became a unit of length.[8][9] An alternative theory links the first Olympia Games to the ancient Greek concept of the "Olympic Truce" (Greek: ἐκεχειρία, ekecheiria), which mandated that any city-state invading another during the Games would face retribution. This is summarized as "no war during the Olympics."[8][9]
The inaugural ancient Olympia Games are conventionally dated to 776 BC, based on inscriptions discovered in Olympia, Greece. These inscriptions list winners of foot races from 776 BC onward, recorded every four years for each Olympia Games.[10] Events included athletics, the pentathlon (discus throw, javelin throw, running, wrestling, long jump), boxing, wrestling, and equestrian competitions.[11][12] Legend attributes the first Olympic victory to Coroebus of Elis.[13]
The ancient Olympia Games held fundamental religious significance. During athletic competitions, sacrificial rituals were held to honor Zeus (whose statue by Pheidias stood in the Temple of Zeus at Olympia) and Pelops. Pelops was a legendary hero famed for his chariot race against King Oenomaus of Pisatis.[14] Victorious athletes were celebrated through poetry and statues.[15][16] The Games occurred every four years in a period known as an "Olympiad," which Greeks used as a unit of time measurement. They were part of a cycle of Panhellenic Games[Note 2] held regularly across ancient Greece.[17]
The Olympia Games peaked between the 6th and 5th centuries BCE but gradually declined after Rome gained hegemony over Greece. Though the exact end date is uncertain, many scholars attribute the termination of the ancient Olympics to 393 CE, when Emperor Theodosius I banned all pagan cults and worship.[Note 3][18] Alternative theories cite 426 CE, when Theodosius II ordered the destruction of all Greek temples.[18] Following this cessation, the Olympic Games would not be revived until the 19th century.
I’m trying to explain this content to a kindergarten student. Please keep the Greek words and citation intact, but make it easy to understand.

Evaluation criteria:
Respond in the same language as the question (English), but maintain the original Greek text and citation notations.
When incorporating existing Greek text or quoted sections, they must be retained as-is.
Make the content easier than the original. (Use simpler terms and sentence structures, etc.)