The way you’re using the decline chest press machine might be killing your shoulder joints. To build a thicker, stronger lower chest, form and elbow position matter. When you flare your elbows out wide, you put unnecessary stress on your shoulder joint and take tension off your lower chest, which is why you end up sore in the wrong places. But when you keep your elbows tucked at about 30° or closer, that’s where the magic happens. Tucked elbows keep your shoulders safe, maximize lower chest acti