HOW TO DO IT: Hold a dumbbell overhead with both hands under the inner plate using a diamond-shaped grip. With your elbows overhead, lower your forearms behind your upper arms by flexing your elbows. Flex your wrists at the bottom of the movement to stop the dumbbell from hitting the back of your neck. Raise the dumbbell back up by extending your elbows while hyperextending your wrists.
HOW TO DO IT: Lie on a bench holding an EZ bar overhead with an overhand grip, above your shoulders, with your arms extended. Lower the EZ bar down to your forehead by bending your elbows. Extend your arms to return to the starting position and repeat.