Ballet dancers are relaxed and calm during their performances... that helps the cock and balls hang quite nicely...
are you kidding? you should talk to a real ballet dancer sometime, or watch them with binoculars. They are sweating, straining, panting, shaking, working like hell. But they have to create an illusion (for those at a distance) that it is all effortless and grace. Performance artists tend to be very high strung in my experience. I don't know any who are relaxed and calm on stage, musicians, actors or dancers. It is very intense, and they have to be every bit as focused and in control of their bodies as athletes. Gymnasts don't have to create the appearance that what they do is effortless, nor communicate other things (like emotions or ideas) by interacting with others while they perform.