Dumbbell Tricep Extensions: This exercise is designed to isolate the lower heads of the inner and outer triceps. Begin by laying on a flat bench on your back. Grabbing two dumbbells, press them to an extended arm position with palms facing each other. Keeping the upper arm stationary lower the dumbbell until one end of the dumbbell hits your shoulders, at this point roll your upper arm back to stretch the triceps, then press and extend the arm back to the starting position.

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Dave Tate