With close contact, deep breathing, crowded indoor spaces and shared equipment, sports are a potential minefield for coronavirus infection.
Athletes playing team sports are obviously at risk, but Japanese karateka Ken Nishimura is one of the lucky ones who can continue training despite all the coronavirus disruption going on around him.
Nishimura, who competes in the 75-kg division, normally trains in Osaka Prefecture, one of seven prefectures covered by the central government's first state of emergency declaration on April 7.