At the LINES Ballet Dance Center in San Francisco, faculty member Erik Wagner leads his class through an adagio combination in center. He encourages dancers to root their standing legs, using imagery of a seed germinating, so that they feel more grounded. "Our studios are on the fifth floor, so I'll often tell them to push down to Market Street," says Wagner. "They know that they should push their energy down to the street level." By using this oppositional force, he says, dancers can lengthen their bodies to create any desired shape.