Prone Y on Bench

The prone Y raise on an incline bench is an isolation exercise for the lower trapezius and rear deltoids, performed lying face-down while raising light dumbbells overhead in a Y pattern. It strengthens the muscles responsible for upward scapular rotation and shoulder health, complementing heavier pressing and pulling work. Because it relies on light loads and strict form, it's typically used as an accessory or prehab movement rather than a primary mass-building lift.

Muscles Targeted

• Primary: Lower trapezius, posterior deltoids
• Secondary: Rhomboids, middle trapezius
• Tertiary: Rotator cuff (infraspinatus, teres minor), erector spinae (isometric)

Starting Position

Set an adjustable bench to roughly a 30-45 degree incline. Lie face down with your chest supported on the bench and feet planted on the floor for stability. Hold a light dumbbell in each hand with arms hanging straight down and palms facing each other.

Execution Steps

1. Brace your chest against the bench and let your arms hang straight down toward the floor
2. Raise both arms simultaneously out and up at roughly a 30-45 degree angle from your torso, forming a Y shape
3. Lead with your thumbs pointing up and squeeze your shoulder blades down and together as you lift
4. Pause briefly at the top where your arms are roughly in line with your ears
5. Lower the dumbbells back down under control to the starting hanging position
6. Repeat for the desired number of reps, keeping your torso pinned to the bench throughout

Form Cues

• Keep your arms nearly straight with just a slight elbow bend throughout the movement
• Lead the raise with your shoulder blades, not just your arms - focus on scapular upward rotation
• Keep your torso flat against the bench; don't let your chest lift off
• Use light weight and strict form - this exercise is easy to cheat with momentum
• Keep your neck neutral and avoid craning your head up to watch the movement

Common Mistakes

• Using too much weight: forces the torso to lift off the bench and shifts stress to the lower back. Use light dumbbells, or none at all when learning the pattern.
• Bending the elbows too much: turns the movement into more of a row and reduces lower-trap and rear-delt isolation. Keep the arms nearly straight.
• Shrugging the shoulders toward the ears: overworks the upper traps instead of the target muscles. Keep the shoulders pulled down and back.
• Rushing the reps: momentum-driven swinging reduces muscle tension. Slow the tempo and pause at the top of each rep.
• Cutting the range of motion short: stopping before full arm extension at the bottom reduces the stretch and overall stimulus.

Variations

• Prone T on bench: arms raised straight out to the sides, emphasizing the middle trapezius and rhomboids
• Prone W on bench: arms bent and raised in a W shape, emphasizing the rear delts and external rotators
• Standing band Y raise: cable or band version performed standing, useful when a bench isn't available
• Floor Y raise: bodyweight-only version lying face down on the floor, suited to beginners or warm-ups

Tips for Progression

• Start with no weight or very light dumbbells (2-5 lbs) to master the scapular movement pattern
• Increase weight only in small increments once form is consistently strict
• Build reps toward 15-20 before adding load
• Add a 1-2 second pause at the top of each rep to increase time under tension

Training Notes

Include prone Y raises 2-3 times per week as a shoulder-health or posture-focused accessory movement, typically for 12-15 reps across 2-3 sets with light weight. Rest 45-60 seconds between sets, and place it either early in a session as an activation drill or later as a finisher for the upper back and shoulders.