Though the Olympics have changed vastly since their inception nearly 3,000 years ago, the modern Olympic Games maintain several similarities to their ancient Greek predecessors. For example, in ancient Greece, the Olympic games were held once every four years between the dates of August 6th and September 19th.
The modern Summer Olympics are still held every four years during the summer months. The modern Winter Olympics are also held every four years, separated from the Summer Olympics by a period of two years. The ancient Olympics originally featured only one footrace competition, with several more running events being added as the Games evolved. Today, running competitions are still a primary focus of the Summer Olympics.