Get ready for plenty of arm circles, power lunges, big jumps and fancy footwork as fitness pro Amy Bento presents a high-energy toning workout featuring four hot combinations set to the music of DJ Brian Howe. Bento follows each combo with a calorie-burning interval "power-up." She also includes a 26-minute body-sculpting routine designed to work several muscle groups simultaneously. The workouts require 3- to 5-lb. dumbbells and a step.