ラジオ体操 (rajio taisō or radio calisthenics) is a communal exercise program that is extremely popular in Japan (it’s akin to Tai Chi in China). A group of Japanese in NYC are trying to introduce this Japanese tradition to New Yorkers experiencing various health issues from their sedentary life during the pandemic. The group meet at 9:00am on Saturday in Central Park East (between 66th and 67th street).
Here is the video demonstration of rajio taisō.
And this is a Guardian article on the history of rajio taisō in Japan.