Bend the elbows so the dumbbell head drops to the front delt. Then roll ten dumbbell back more so you can pull your elbows up and in. When you do this you should feel more of a stretch and some pressure on the distal end of the medial tricep (meaty part inside your elbow that moves weight). Then try to punch your hands through to the top without your elbows dropping too much.
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3-8 x 8-20