Mix elements of Pilates-based exercises with yoga-based poses in these five 10-minute workouts designed to steamroll the abdominals. The Core Fusion program, created by fitness gurus Elisabeth Halfpapp and Fred DeVito, blends core-related movements with strength-training to create a slimming workout, one that has been touted by People and Shape magazines, as well as by such movie stars as Julia Roberts and Cameron Diaz.