Circuit training explained

A circuit is an exercise cluster that contains repeated short-to-long bouts of high-intensity exercise with intervals of recovery, which we refer to as high-intensity interval training (HIIT). Circuits can be performed in an unlimited number of ways, with varying work-to-rest ratios and training intensities. You will see circuits described on the Biolayne Workout Builder as both cardiovascular-type training programs as well as hypertrophy-based training programs.

For example:

Exercise 1 - Set 1
30 secs rest
Exercise 2 - Set 1
30 secs rest
Exercise 3 - Set 1
30 secs rest
...etc

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longer rest period

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Exercise 1 - Set 2
30 secs rest
Exercise 2 - Set 2
30 secs rest
Exercise 3 - Set 2
30 secs rest
...etc