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For circuit training, choose 8-10 exercises and set up your free weights or other equipment. Do 30 sec of one exercise, 30 sec of walking in place, jump rope, or exercise bike; then 30 sec on the next exercise and 30 sec aerobic, and so on. Circuits don't give you as much strength as regular weight training or as much aerobic fitness as aerobic workouts, but it gives you some of each. This training is good for variety or when you are short of time.