How To Reverse Fly with Dumbbells Reverse Fly with Dumbbells Preformed by TrainerKelli Reverse Fly with DumbbellsGrab a pair of dumbbells and stand with your feet hip-width apart and your knees slightly bent.Hinge forward at the hips and let your arms hang straight down from your shoulders, palms facing your body.Raise both arms out to the sides as you squeeze your shoulder blades together.Return to start.That’s one rep.