"Radio taiso", or radio calisthenics

  During summer vacation, "radio taiso" or "radio calisthenics" is held in the neighborhood minipark from 6:30 every morning. About 20 adults and 30 children gather in the minipark from the neighborhood, and do exercise to music on the radio.

  The following is an explanation of Radio taiso in Japan from Wikipedia:

  Radio taiso were introduced to Japan in 1928 as a commemoration of coronation of Emperor Hirohito. The idea for radio broadcast calisthenics came from the US, where during the 1920s the Metropolitan Life Insurance Co. sponsored 15-minute radio calisthenics in major cities in the US. Visiting employees of the Japanese postal insurance division brought samples of the exercises from the US back to Japan. The exercises were widely used to improve the health of Japanese soldiers both at home and abroad during the 1930s and 1940s. After Japan's defeat in 1945, the broadcasts were banned by the occupying powers as being too militaristic in nature. After several rewrites to the routine, it was reintroduced by NHK radio in 1951 with the support of education ministry, health ministry, the Japan Gymnastic Association, and the Japan Recreation Association.