Bring the arms back to the starting position and repeat until completing 8 sets until failure, allowing yourself only 20 seconds of rest between sets. (fitnessandpower.com)
Instead of guessing that you'll need three minutes of rest between sets ahead of time, you can decide that during your workout. (completehumanperformance.com)
Allow yourself only 10 seconds of rest between exercises and 2 minutes between rounds. (fitnessandpower.com)