Yoga domes are seen in Toronto, Canada, on June 22, 2020. A new pop-up event called "Hot Yoga" has been held in Toronto from June 21 to July 31. People can take part in yoga classes inside their own private dome to prevent the spread of COVID-19. (Photo by Zou Zheng/Xinhua)

A staff member (R) cleans a yoga dome after use in Toronto, Canada, on June 22, 2020. A new pop-up event called "Hot Yoga" has been held in Toronto from June 21 to July 31. People can take part in yoga classes inside their own private dome to prevent the spread of COVID-19. (Photo by Zou Zheng/Xinhua)

A woman performs a yoga posture in a dome in Toronto, Canada, on June 22, 2020. A new pop-up event called "Hot Yoga" has been held in Toronto from June 21 to July 31. People can take part in yoga classes inside their own private dome to prevent the spread of COVID-19. (Photo by Zou Zheng/Xinhua)

A woman performs a yoga posture in a dome in Toronto, Canada, on June 22, 2020. A new pop-up event called "Hot Yoga" has been held in Toronto from June 21 to July 31. People can take part in yoga classes inside their own private dome to prevent the spread of COVID-19. (Photo by Zou Zheng/Xinhua)