In this picture taken on January 11, 2021, young gymnasts train at the Li Xiaoshuang Gymnastics School in Xiantao, Hubei province. This summer's delayed Tokyo Olympics, which are now due to start on July 23, 2021, will be the defining moment for Chinese gymnasts who have trained relentlessly since as young as age four in the pursuit of gold. (Photo by Nicolas Asfouri/AFP Photo)

Russian servicemen display military camouflage equipments during the joint military anti-terrorist command and staff exercise of the armed forces of the Shanghai Cooperation Organization member states Peace Mission-2021 at the Donguz training ground in the Orenburg region, Russia, 23 September 2021. More than 3.4 thousand servicemen from Russia, India, China, Pakistan, Tajikistan, Uzbekistan, Kazakhstan, Kyrgyzstan and more than 600 units of weapons, military and special equipment are involved in the exercise Peace Mission-2021. (Photo by Maxim Shipenkov/EPA/EFE)

A woman crosses the street on a foggy morning in Frankfurt, Germany, Friday, October 29, 2021. (Photo by Michael Probst/AP Photo)

Participants at the Dubai Run at Sheikh Zayed Road in Dubai, United Arab Emirates on November 26, 2021. (Photo by Ruel Pableo for The National)

Horizontal lightning was captured in this picture taken over an hour in Ensenada, Mexico on October 28, 2021. (Photo by Edgar Lima/Animal News Agency)

A professional training in explosive disposal is held in Nanning, Guangxi, China on 18th February, 2021. (Photo by Top Photo Corporation/Rex Features/Shutterstock)

Mount Sinabung looks calm as seen from Karo, North Sumatra at dawn on August 8, 2021. (Photo by Tibta Nangin/AFP Photo)

A fishing boat (L) heads out to sea at dawn in Lhokseumawe, Aceh on August 9, 2021. (Photo by Azwar Ipank/AFP Photo)