Interval workouts incorporate a variety of activities that are powerful and short in duration. These intervals create an anaerobic workout that forces the body to adjust to variations of intensity and motion. Interval training has the real potential to burn fat and build strength. The Firm: Body Sculpting Basics utilizes these same aerobic and anaerobic components to create a 60-minute workout that promotes strength and stamina. Instructor Susan Harris presents simple dance-style aerobic combinations and weightlifting techniques that are sure to make you break a sweat. This video is somewhat dated (lots of '80s-style leg warmers and traditional dance aerobic movements), but the content is so stellar that it would more appropriately be coined as a fitness classic. Pliés, squats, and split-leg lunges work the major muscles of the lower body, while lateral raises, curls, and push-ups concentrate on the upper body. Light weights (5 to 8 pounds) are used throughout this workout, and a set of ankle weights may be helpful if you are looking for a challenge. Cueing comes quickly and Harris does not give much information on form or body alignment. Therefore, beginners should watch the informational portion of this video (the segment immediately before the workout) in order to train as confidently and safely as possible. This is a brilliantly designed program that merges weight training and cardio in an effective and approachable (not to mention quick) package. --Olivia Voigts
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