IOC: Athletes must compete in the gender category in which they feel best 
The International Olympic Committee (IOC) has issued a set of recommendations sports federations on participation in transgender competitions. The document is available on the website of the organization.
The published document defines the basic principles of working with transgender people and persons with the opposite gender gender identity. In the opinion of the IOC, all athletes, regardless of gender, gender identity or status, should be eligible to compete. “Athletes should perform in the gender category in which they feel better,” the organization notes.
Detailed criteria for admission to competition must be established by the federations in each sport separately. An athlete will only be refused if it is proven that his advantage is unfair or that there is a possibility of harm to other athletes. The evidence must be strong and the inadmissible athlete will be able to appeal the decision to the Court of Arbitration for Sport (CAS). The committee recommends that athletes not be required to undergo testosterone tests. This figure is no longer a sufficient reason to refuse to participate in the competition.
In August 2021, the International Skating Union (ISU) made a statement on transgender athletes. The organization said it has developed special rules for such athletes. To move from the women's category to the men's athlete, it is enough to write a written application, after which he will receive permission to compete. At the same time, athletes who begin to undergo hormone therapy will lose the opportunity to compete in women's competitions.
For those who decide to change the men's category to women's, there are restrictions on the amount of testosterone in the body. Its level must not exceed five nanomoles per liter during the 12 months prior to the first competition and during the entire subsequent competition period.