India recorded its highest-ever daily vaccination count on Monday as it opened up free shots to all adults.
The progress with inoculations came on International Yoga Day, with Prime Minister Narendra Modi hailing the practice's "protective" properties against the coronavirus.
The country's vaccination drive had significantly slowed in recent months due to a shortage of jabs and hesitancy, even as it battled a vicious surge in cases in April and May that overwhelmed the healthcare system in many places.
Case numbers have since fallen sharply and the authorities have again relaxed many restrictions, sparking fears of another wave.
The government had expanded the vaccine roll-out to include all adults aged below 45 on May 1, but states and private hospitals had to procure and buy the shots themselves for the younger age group, leading to confusion and shortages.
But New Delhi later changed tack, announcing it would procure 75 percent of vaccine supplies and distribute them to states so they could inoculate people for free.
The health ministry reported that a record 7.8 million jabs were administered on Monday, in contrast with an average of three million shots a day in recent weeks.
"Today's record-breaking vaccination numbers are gladdening. The vaccine remains our strongest weapon to fight COVID-19... Well done India!" Modi tweeted.
The country has administered 280 million shots in total, but barely four percent of people are fully vaccinated. The government aims to inoculate all of India's almost 1.1 billion adults by the end of the year.
"The vaccination drive is expected to pick up speed now... the daily vaccination has picked up over the last week and is expected to strengthen further," community health expert Rajib Dasgupta told AFP.
"However, both existing inequities as well as hesitancy merit deeper attention to make this a success."
- Yoga push -
The free roll-out came as Modi marked the annual Yoga Day with an early-morning address to the nation, saying the practice had again proved itself to be a source of "inner strength".
"When I speak to frontline warriors, they tell me that they have adopted yoga as a protective shield in their fight against coronavirus. Doctors have strengthened themselves with yoga and also used yoga to treat their patients," the Indian leader said.
Public parks were re-opened in Delhi on Monday, but the number of events for Yoga Day was cut back around the country for the second year running because of the pandemic.
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 government has touted yoga and herbal medicines -- sales of which have boomed -- to protect and give relief to people infected with the virus.
But evidence is scant and the claims have faced pushback from India's doctors, who wore black armbands last month to protest Baba Ramdev, a guru with ties to the Modi administration who has said yoga can cure Covid-19.
India is the world's second most infected nation with nearly 30 million coronavirus cases and more than 388,000 deaths, although experts say the actual toll could be much higher due to underreporting.
Authorities said late Monday that the Amarnath Yatra -- an annual Hindu pilgrimage to a cave shrine in Kashmir that draws some 300,000 participants -- would be cancelled for the second straight year due to the pandemic.