Stand with the feet hip-width apart, hold one dumbbell in each hand with the palms facing up, and the elbows close to the rib cage. Sink back into the hips and press the left foot into the ground to turn to the right, keep the left elbow bent and perform an uppercut with the left arm, bringing the left elbow to shoulder-height. Slowly lower the left arm and turn back to the center. Push the right foot into the ground to turn the left hip while swinging the right arm up in an uppercut.