The dumbbell lat raise puts a huge focus on attacking our side delts and getting a great shoulder pump to start the workout. Charles teaches a unique form on this, so I highly suggest you watch the short video above. With this exercise we are targetting the largest part of the shoulder, the side delt which is what will give you that 3D shoulder look from the side. The key with this move is you want to keep your chest up, and think about pushing the weight away from your body instead of lifting the weight up, which will get your traps too involved.
This is definitely a move you will want to go very light on and make sure you have perfect form. Another unique form cue on this db lat raise is that you will be internally rotating your elbows as you push the weight up, so your hand will be pointing down. If you have a current shoulder impingement or have a nagging ache or pain in your shoulders I don't recommend this, but if your shoulders are healthy this will put even more activation on your side delts.