Confined at home during the ongoing coronavirus pandemic, many have found Japan's long tradition of radio calisthenics to be a great way to stay in shape. Radio calisthenics first arrived in Japan in 1928, when the average Japanese life expectancy was still less than 50. Performed in homes, schools and workplaces, the movements take just 3 minutes to complete, yet their scope is remarkably wide. We examine the history, popularity and health benefits of this familiar early morning routine.