High-stepping Coco Rocha has made a high-impact return to New York fashion week this season, walking for Halston, Carolina Herrera, Peter Som, Rag & Bone, Rodarte, Jonathan Saunders, Thakoon, Diane von Furstenberg…and so on. That's a schedule scary enough to unbalance the most Zen of composures and tighten the most Yoga Zoned of muscles. Yet Rocha is the model of unflappability. How does she do it? Did she learn some kind of limbering trick, back when she was but a step-dancing lass in Vancouver? As she dashed from Anna Sui's show at Bryant Park to Derek Lam's at the gone-but-not-forgotten Tunnel yesterday, we asked her. "I wish I could tell you I had a secret, but I don't. But I guess if I had to give a tip for staying sane, it'd be: Stick around the good vibes. You can't let other people's negative energy get you down." And, we might add, be a homebody. "I get home at 11. I never end up going to sleep before 1 a.m., but that's because I like to hang out in my apartment for a while. You know, watch TV, drink, eat, surf the Internet." She laughed. "That's my party!"