Patients exercise at the balconies of a training center, which has been converted into a quarantine house, in Tangerang, amid the coronavirus disease (COVID-19) outbreak, May 28, 2020. REUTERS/WIlly Kurniawan

Patients exercise at the balconies of a training center, which has been converted into a quarantine house, in Tangerang, amid the coronavirus disease (COVID-19) outbreak, May 28, 2020. REUTERS/WIlly Kurniawan

Doctors, nurses, and volunteers participate as patients (not pictured) exercise at a training center, which has been converted into a quarantine house, in Tangerang, amid the coronavirus disease (COVID-19) outbreak, May 28, 2020. REUTERS/WIlly Kurniawan

Patients exercise at the balconies of a training center, which has been converted into a quarantine house, in Tangerang, amid the coronavirus disease (COVID-19) outbreak, May 28, 2020. REUTERS/WIlly Kurniawan

Patients exercise on the balconies at a training center, which has been converted into a quarantine house, in Tangerang, amid the coronavirus disease (COVID-19) outbreak, May 28, 2020. REUTERS/WIlly Kurniawan

Patients wave at each other from their balconies at a training center, which has been converted into a quarantine house, in Tangerang, amid the coronavirus disease (COVID-19) outbreak, May 28, 2020. REUTERS/WIlly Kurniawan