Petite and ice-blonde, Andersen is maybe the best endorsement for her expanding business — she just opened a second studio on Howard Street in New York’s SoHo. “We really wanted to make something that felt beautiful and luxurious,” she said of the space. With whitewashed walls, lots of glass, and stadium seating (that doubles as storage) in the waiting area, it feels more like a spa than a place to work out.