Women's fashion designer Trina Turk is no stranger to the mat—she regularly does yoga, Pilates, and barre classes. So it makes sense that she brought her love of movement to her clothing line and started making activewear this year. “Everything we produce is upbeat and happy,” says the Los Angeles local. “If I’m not feeling that way, it comes through in the collections, so I try to remain levelheaded. Exercise and yoga help me maintain my calm.” Here, Turk shares what she carries to class—along with her own fab leggings and tanks, of course.