Today I went an did my chest workout at my gym. I realized as I was doing machine incline presses and machine flat bench presses that my arms and shoulders were getting more of a workout then my chest. I've been trying to contract the muscles in my chest, but it just doesn't seem to be working. I did standing cable crossovers just fine and felt my pecs getting a workout. Any tips for those machine presses and how to contract my chest muscles more effectively?