Sit on an exercise ball and roll out until your lower back is supported, creating an incline with your torso; hold one dumbbell at shoulder height in the working hand.
Brace your core to stabilize on the ball.
Press the dumbbell straight up until your arm is fully extended.
Lower it back to shoulder height with control and repeat for the desired reps before switching arms.
Dumbbell Incline One Arm Press on Exercise Ball · Gainzz