A twelve-year-old girl is asking about the ruling on doing sports in mixed venues
Question

                I am concerned about this subject matter I am a female at the age of twelve and I practise martial arts taekwondo I wear my hijab during these classes. 
 
The session is mixed female and male. Is it okay if I continue my training that enjoy very much even after I receive my puberty. I will start to wear hiab permanently then, but my question is must I quit my training .
Praise be to Allah.
      How good it is that this Muslim girl, who is so young, is 
      keen to ask about matters of her religion and is keen to make her life, 
      behaviour and attitude in accordance with her religion. Whatever her 
      religion allows, she does it and avails herself of this concession. 
      Whatever Islam does not allow, it is best to keep away from, and what 
      Allah has permitted His slaves is sufficient and there is no need to 
      transgress His limits and do what He has forbidden. 

    It is clear that one of the aims of sharee‘ah is that women 
    should cover themselves and guard their chastity, and that a woman should 
    not show her charms to a man who is a stranger (non-mahram) to her. 

    It is well known that when girls do sports, especially games 
    involving strength or some other games which need particular effort, when 
    they do these sports in mixed clubs and venues, it leads to the girl showing 
    a great deal of her charms, and showing that which is not appropriate, 
    especially when these exercises cannot be done wearing full jilbab. 

    We have discussed the guidelines on women participating in 
    sports, the most important of which is that it should be out of the sight of 
    non-mahram men. See the answer to question no.
    115676. 

    Doing the exercises that a woman needs at home means that she 
    has no need to go to clubs and open places, because that usually involves 
    uncovering and mixing. 

    In the answer to question no.
    1200 we have discussed the 
    prohibition on mixing because of the serious bad consequences to which it 
    leads. 

    It should be noted that many girls reach puberty and thus 
    become fully accountable when they are twelve years old. If she has not yet 
    reached this stage, she is very close to puberty and has reached an age at 
    which men may be attracted to her. A girl like this should cover and avoid 
    mixing with men and so on, just as is required of an adult woman. 

    See the answer to question no.
    43485. 

    The Muslim woman should be keen to do sports that are in 
    accordance with her nature and femininity and avoid violent sports which may 
    affect her body and may cause her real harm. 

    We ask Allah to guide you to that which is good for you in 
    this world and in the Hereafter. 

    And Allah knows best.