Is ballet haram if you are taking it for strengthening, posture, and stretching purposes? I know that it is haram if you perform in front of people and there are boys in the class, but if it was an all-girls class would it be considered haram? I know I cannot perform because I am a Muslim woman, but just out of curiosity.
It is not permissible, unless one performs the exercises without the music, without the intention of dancing and in privacy, without non-mahram onlookers, as an exercise routine only.