Position your upper back and shoulders on a stability ball once again as shown below. Hold a dumbbell in each hand and extend your arms above your shoulders, palms facing in.
Bend your elbows to lower the weights towards either side of you head; your fore-arms should be parallel to the floor at the end of hte motion. Slowly extend your arms to bring the dumbbells back to the starting position.
Tip: Focus on keeping your feet on the floor throughout your entire set; this will keep you stable.
Triceps Extension on Exercise Ball