These exercises are done in a circuit one after the other, typically for a total of eight to twelve exercises in a specific sequence. The sequencing of the exercises allows you to move from one exercise station to the next with minimal rest time between exercises, generally 30 seconds or less.
A common circuit is alternating upper-body exercises with lower-body exercise (ie. bench press to leg press to overhead press, followed by leg curls, etc.). Another common circuit training system invloves alternating pushing exercises with pulling exercises (ie. bench press to seated cable pull to overhead press, followed by a lat pull, etc.).
It’s one of the most efficient workout systems because you work the entire body in a short amount of time, usually just 20-30 minutes. And it burns a lot of calories, making this a favorite of many trainers.