30-MINUTE BACK BLAST
Circuit training is a form of body conditioning or endurance training or resistance training using high-intensity aerobics. It targets strength building and muscular endurance.
An exercise "circuit" is one completion of all prescribed exercises in the program. When one circuit is complete, one begins the first exercise again for the next circuit.
Traditionally, the time between exercises in circuit training is short, often with rapid movement to the next exercise.