What is the ruling on learning advanced martial arts that rely on harnessing body energy and strengthening muscles through breathing techniques, which enable the practitioner to perform extraordinary feats, especially if these arts are free from magical practices, such as the Indonesian art of "TENAGA DALAM"?

There is no harm in practicing methods free from magic, superstitions, pagan beliefs, polytheistic rituals, and Sharia violations, if their purpose is to acquire a permissible skill. However, what I have seen in this field is not free from these reprehensible acts. As for the art of TENAGA DALAM, we have no knowledge of it, and we do not trust the translated pages about it, even though most of them are not free from reprehensible acts.