YouTube workout video star Zuzka Light presents her long-awaited debut fitness book, with a 30-day fitness regime of powerful, effective 15-minute workouts.Filming first from a tiny basement in Prague, and eventually settling in Los Angeles, Zuzka Light has single-handedly ushered in the YouTube fitness revolution. Viewers love Light for her short, ferociously effective workouts and her in-the-trenches, never-give-up positive attitude—and she’s racked up more than ...