If you are really serious about your fitness and want a website which can be your one stop for life-long fitness, you must visit http://www.uft1.com/ One Arm Dumbbell Triceps Extension: Target Area, Preparation, Correct Position and Technique. Avoid any injury. Use the right dumbbell press form. Primary Muscle(s): Triceps Brachii Secondary Muscle(s): Anconeus Flexor Carpi Ulnaris Extensor Carpi Ulnaris Preparation: Select the desired weight. Sit on a short padded seat with your back against the pad and feet flat on the floor. Execution: While holding hold a dumbbell in one hand with your arm extended upward, support your bicep with the other hand. Lower the dumbbell behind your neck until you achieve a full stretch on your triceps. Return to the starting position. Repeat. Alternate arms. Note: For proper breathing, exhale when pushing up inhale on the return.