noun
radio calisthenics
A set of exercises broadcast on radio (and sometimes TV), widely practiced in Japanese schools, workplaces, and community events.
毎朝、公園でラジオ体操をしている。
I do radio calisthenics in the park every morning.
Compound of ラジオ (radio) and 体操 (gymnastics, calisthenics). The term refers to the nationally broadcast exercise program that started in 1928.