The Rear Delt Machine Can Help You Sculpt Your Back. A Dumbbell Rear Delt Fly Strengthens Your Upper Back Muscles And Shoulders While Working On Stabilization Strength In Your Spine, Deep Abdominals And Hips. Large Oversized Grips Accommodate Users Of All Sizes Forward-Facing User Position For Both Movements Provides Greater Comfort And Ease Of Use Wide Motion For Improved Bio-Mechanics And Dual Function Incremental Weight Angled Pads And Ideal Pivot Location Promote Full Muscle Contraction And Alignment Clearly Indicated Adjustments For Ease Of Use