The decline dumbbell fly and press is a dumbbell complex that targets the chest muscles, particularly the lower pecs. By alternating the single-joint fly with the multijoint press, you get the benefits of both and put serious stress on the chest muscles even with relatively light weight. Because the fly will be the limiting factor in weight selection, this pairing is usually performed for moderate to high reps, such as 8-12 reps per set or more, as part of upper-body or chest-focused training.