Keep it moving and don't be tempted to down tools during a set; that's what the 90 - second breaks between sets are for! (womenshealthandfitness.com.au)
They were asked to cycle in high - speed bursts of one minute, with a 75 second break in between. (sciencedaily.com)
Take a 45 - 60 second break after you complete the circuit each time before starting again. (dietsinreview.com)