
It follows the International Olympic Committee's (IOC) decision to promote a more flexible programme as part of its Agenda 2020 reform process, in which new sports and disciplines are considered.
Although the practical repercussions of these changes still remain unclear, baseball and softball are thought to be the most likely to reap the benefits and be included in Tokyo, due to the huge popularity of the sports in Japan.
Squash, karate and skateboarding are among others campaigning for admission, while many other sports already on the programme are proposing new disciplines and events.

But 3x3, the innovative form of its five-a-side cousin which was first showcased to the world at the 2010 Summer Youth Olympic Games in Singapore, has several influential supporters within the IOC.
"This is a step forward that gives us big hope that at the 2020 Olympics the Organising Committee will include 3×3 as an additional event," Muratore told Agence France-Presse.
"It is our goal to strengthen 3×3 worldwide and be part of the Olympics.
"At the last Youth Olympics in Nanjing, countries that you would usually never hear of in traditional 5×5, such as Andorra, Iraq, Qatar, Guam, smaller nations, are now actually making it on the international stage."
In June this year it is due to feature at the inaugural European Games in Baku, instead of five-a-side basketball.
There appears no chance of five-a-side basketball losing its Olympic place, but after a rapid upsurge in popularity in recent years, inclusion for 3x3 would offer many benefits to an Olympic Movement keen to boost its appeal to youth populations.
Last year, FIBA secretary general and IOC member Patrick Baumann told insidethegames that 3x3 basketball was the "future of the sport".
But, due to the IOC's reluctance to increase the total number of events and athletes at the Games, if it is to be successful in its Olympic ambition 3x3 basketball may have to fend off competition from other sports seeking to add new events.
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