What is this meditation technique?

A friend of mine was telling me about how her father has great interest in Tai Chi and meditation. We were talking one night about it and she said that when her father meditates he said he "releases energy and make the room get all foggy and the walls start to sweat". This seems very unlikely but her family co-signed with her and she is a very trusted friend of mine. I'm really interested in learning this technique and its origins. If there is a specific name for this it would be more than extremely helpful.