Recently some Muslim schools had a girls netball tournament.

Answer

When it is not permissible for women in full hijaab and shabbily dressed, to perform Salaat in the Musjid, how could it ever be permissible for Muslim girls to act like immoral kuffaar females jumping and prancing like baboons on a field where all and sundry can view them? These schools are not Muslim schools. They are the schools of the Devil –Iblees, La-een. A Muslim is not in need of brains to understand that female exhibition is a dimension of zina.