This 1997 beginning-level, interval-training workout alternates intervals of 3-1/2 minutes of aerobic exercise with 1-1/2 minutes of strength training, so your heart rate stays elevated for a total of 31 minutes. The aerobic segments are simple steps, repeated frequently. Some are high-impact (jumping and jogging), and although Austin has two assistants, neither demonstrates low-impact alternatives, which would have given beginning and overweight exercisers more options. The strength segments also could have been designed better. The first strength interval works the shoulder muscles, which are small (especially in women) and fatigue easily, so they are therefore usually worked later in a workout. Another exercise that Austin says targets the chest really doesn't, because it's done standing where gravity puts more of the load on the shoulders again. The shoulders get their third interval later on, so your shoulders are likely to be tired, while the larger muscles of your chest and back get minimal work. After the interval workout, Austin does eight minutes of standing leg exercises and abs, and finally a stretch. --Joan Price
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