A grouping of sets where agonist and antagonist exercises for opposing muscle movements are performed in tandem without rest.
Super-sets pair to opposing muscle groups, such as the biceps and triceps, into one continuous exercise. This is done by selecting two different exercises, one for each muscle, and doing one set of each back to back with as short a pause as possible between them. Super-set training reduces the recovery time needed between sets as well as the amount of time needed to complete a workout. However, super-sets generally use low weight and high reps, making them better for size and physique training than strength training.
Remember that a super-set specifically deals with opposing muscle groups. Many lifters will confuse a super-set with a combo-set, where any two exercises are performed in tandem without a break in between them, such as push-ups followed immediately by squats, which are not opposing muscle groups.