“When I talk to frontline warriors, when I talk to doctors, they tell me that in the fight against the coronavirus, they used yoga as a protective shield，" said Indian Prime Minister Narendra Modi as he kicked off another muted International Yoga Day. "When I talk to frontline warriors, when I talk to doctors, they tell me that in the fight against corona, they used yoga as a protective shield,” he added. Yoga Day -- proposed by Modi and adopted by the United Nations in 2014 -- is observed mostly in India, but also worldwide on the Northern Hemisphere's longest day. Throughout the pandemic, India's ministry of yoga and ayurveda has touted yoga and herbal medicines -- sales of which have boomed -- to protect and even cure those with the virus.