well, i'm a huge fan of dancing myself, and i think this phrase refers to a very common trait in many dances which is it's ability to portray feelings. Their are people (dance therapist) who can actually give you therapy based on what you portray about yourself through dance. The way you dance says a lot about you, and people such as myself often use dance to portray feelings. (ex: "I'm so happy I could dance!" or "I had a tough day, so I'll just dance it off") So in a nutshell, it means that how you dance portrays your inner feelings. Hope I've been helpful!