I'm totally confused by the concept of circuit training. Can you break it down to the simplest instructions?

Circuit training is an excellent way to simultaneously improve mobility, strength, and stamina. An example of a circuit training workout is to do two to six different circuits, each containing two or more strength/cardio exercises that are completed one right after the other, with little or no rest in between. You do one set of an exercise for a specified number of repetitions (or a prescribed amount of time) and then move on to the next exercise. Once you complete one set of each exercise in a circuit, you go back to the beginning of the circuit and repeat the exercises until all the sets are completed and you can move on to the next circuit of exercises.

There is no rest period within a single circuit, but completed circuits should be separated by a rest period of 30 seconds to one minute. The total number of circuits performed during a training session may vary from two to six, depending on a number of factors, including your training level and your training objective (for example, are you preparing for a competition, and if so, how much time do you have to prepare?). The workouts include the cardio intervals (one minute of jumping jacks, one minute of mountain climbers, and so on) to keep your heart rate elevated for maximum calorie burn.

Get more fitness tips from Jillian Michaels.