Is it permissible to watch films of female dancers to learn dancing based on the husband's request?

It is not permissible to watch recorded dancing due to its inclusion of music and the exposure of 'awrah (parts of the body that should be covered), as it causes hardness of heart and distance from Allah. If dance films are free from music and the exposure of 'awrah, and do not distract from obedience [to Allah], then there is no harm in watching them. However, the fulfillment of these conditions is almost impossible.