Sometimes, with similar exercise for the same body part, one is easier than the other. Therefore, when you get tired doing the tougher movement, you still have the strength to perform the easier one. Compounding exercises involves doing a set of the harder exercise, immediately followed by more repetitions of the easier one. A good example dumbbell flys and dumbbell presses for the chest. The flys involves just the pectorals. If you lie on a bench and go to failure with flys, you will find you still have the strength to do presses, which bring in the triceps and deltoids to help. Another example is dumbbell laterals and dumbbell shoulder presses. If you do the laterals to failure, you can still continue doing more reps by switching immediately to presses, thereby shocking the deltoids by the extra effort.

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