Lying Dumbbell Tricep Extensions
Make sure you use a lighter weight for this exercise. With a dumbbell in each hand, start from a seated position holding the dumbbells at your waist.
Carefully lie down on your back on the bench.
Extend your arms upwards and have your palms facing each other.
Bending your elbows, and keeping your upper arms still, carefully lower the dumbbells down until they are near your ears. Then raise the dumbbells back up to starting position.