Pullovers should be part of any chest routine. Use them as one of the last exercises of the workout after other muscles are already fatigued.
Finish your next chest workout with dumbbell pullovers: 3-4 sets of 12-15 reps. Focus on squeezing the pecs to initiate the movement up from the bottom position and work on holding the squeeze throughout the rep.
High intensity vs. volume training. Olympic lifting vs. powerlifting. High intensity cardio vs. low intensity cardio. The list of debates and disputes in this field goes on and on, and perhaps the most disputed area is abdominal training.