Olympic athletes will be given daily tests for the coronavirus during their time in Tokyo for the delayed 2020 Games, all part of tighter countermeasures to show the event was still on track.
Spectators from overseas have already been ruled out, and a decision on whether to allow domestic spectators will be taken in June, a few weeks before the Games begin on 23 July.
The organisers, who include the Tokyo 2020 organising committee, the International Olympic Committee (IOC), the Japanese government and the International Paralympic Committee, said in a joint statement that they would "deploy all possible countermeasures and place the highest priority on safety".
With less than three months to go to the Games, and the Japanese public increasingly sceptical about their viability, the organisers were finalising a second edition of the "playbooks" that will set the rules for the staging of the event.
Athletes and those in close contact with them will be tested every day, while all participants will be required to record two negative tests before arrival.
Participants will not be allowed to use public transport, and will have to eat in specific locations with special hygiene measures. They must wear face masks at all times except when eating, drinking, sleeping, training or competing, according to an updated version of the 'playbook' of rules prepared by organisers of the Games.
The playbook also said all people visiting Japan for the Games were required to have a smartphone and to download two apps for health reporting and contact tracing. Athletes will receive a Samsung smartphone, it said.
Parts of Japan including the capital were put under a new state of emergency at the weekend, and most of the Japanese public think the Games, postponed from 2020 because of the pandemic, should be cancelled or postponed again.
The emergency, which is due to last until 11 May, requires restaurants and bars serving alcohol to close along with large stores, cinemas and other commercial facilities; asks firms to let staff work from home; and excludes spectators from big sports events.
Thomas Bach, head of the IOC, fully understands the decision to declare a state of emergency in Tokyo to fight the coronavirus pandemic, and was committed to holding a safe, successful Games.
Bach was speaking at the start of a meeting with Tokyo 2020 organisers to finalise the second edition of the "playbooks" of rules for the Summer Games, with less than three months to go and Japan battling a surge of coronavirus cases.
Speaking by video link, Bach told organisers, including Tokyo 2020 President Seiko Hashimoto, that he understood the move, and that compliance with the playbooks, which lay out a number of anti-infection measures, would be strictly enforced.
"The IOC is fully committed to the successful and safe delivery of the Olympic and Paralympic Games," he said.
An earlier edition of the rules, which came out in February, banned singing and chanting during events and mandated that event participants wear masks at all times except when sleeping, eating or outdoors.
Spectators from overseas have already been excluded, but more than 10,000 athletes, coaches and their entourages are expected in July.
Athletes and coaches will undergo virus testing on a daily basis, according to media reports. Kyodo news agency said officials who come into close contact with athletes will also need to be tested every day.
A decision on the number of domestic spectators allowed into venues may not come until June.
Though Japan has not suffered as badly from Covid-19 as many other countries, the infection rate has risen back to levels not seen since January, and more and more are from variant strains. On Wednesday, Tokyo reported 925 new cases.
The Games run from 23 July to 8 August.