Double Dumbbell Skull Crusher
Lying on your back or on the floor, put your arms out long, up towards the ceiling firmly grasping two dumbbells, one in each hand. You should be able to draw a straight line through your shoulder, your elbow, and the dumbbell. Your palms should be facing each others. Allow your elbows to slowly start bending. Bend the elbows to about 90 degrees and pause. Tighten those triceps up (the back of your arms) and see if you can feel those muscles pulling your arms to lift the dumbbells up. Gradually straighten out your arms. Make sure to keep your wrists strong. Do 8 to 12 of these.
SPECIAL NOTE: For all the In the Gym: Cable and Dumbbell exercises pick a weight that you can do for 8 to 12 reps fairly comfortably and with perfect technique. After a couple of weeks of performing at this weight and with perfection, on then, move up to a slightly heavier weight that feels challenging once you get to that 8th or 12th rep. Once you feel absolutely confident in performing every rep with absolute perfection, only then, go to a heavier weight that is challenging you through out the set.