This Scooby's Workshop video shows proper form of the incline dumbbell fly exercise for pecs. Fly type exercises have done far more for my pec development than the pushing type exercises. In doing flys, make sure that your arms do NOT go behind the plane of your body as this puts too much stress on the shoulder joint. If you don't have a incline bench, you can make one as I have done here by tying a 2x8 securely to a coffee table. This exercise is best done with a spotter for safety, if you must do it alone use light weights and high reps.