This aero/tone interval workout alternates intense cardio with fast-paced, multi-muscle body-sculpting (compound exercises). It’s a smooth-flowing format that keeps your body blasting calories for the entire 64 minutes. All the toning segments feature functional, progressively intensifying exercises. Kelsie Daniels makes them doable by carefully layering in the add-on sequences (so you already have a feel for the timing before you do the movement). The aerobic sections include straight-forward calorie burners like jacks, step touches and grapevines.