Doing circuits at the gym

Many gyms have a dozen or so machines arranged in a circle or row called a circuit. They’re placed in a logical order (from larger to smaller muscles) so you can move from machine to machine without having to use any brainpower to decide which exercise to do next.
Some fitness facilities, such as Curves®, revolve entirely around circuit training.
Many facilities also offer cardio-resistance circuits where in-between strength training stations, they have cardio stations. For example, you may jog or march in place, do jumping jacks, or jump on a trampoline in-between lifting weights. The concept behind these workouts is keeping your heart rate at the low end of an aerobic training zone so you also receive some aerobic conditioning benefits as well. Because this workout represents a compromise, you’re not getting an optimum cardio or strength workout. Instead, you’re trying to hit two goals at once, which is of course, better than hitting only one or no goals, especially if you’re time crunched. After reviewing weight training principles, you may understand why circuits are a good place for beginners to start training. Typically, you’ll do one set at each machine and have about a 30-second rest interval between stations. This is the lower intensity side of the spectrum and has a reduced risk of injury.