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 In 15 MINUTES TO FIT, her hotly anticipated debut, she offers a 30-day fitness plan guaranteed to burn fat and build ripped muscles. Based on innovative high-intensity interval training, the workouts are designed to be done anywhere, anytime (no fancy gym equipment necessary), in just 15 minutes a day.