The prone Y raise is performed lying face down with both arms extended at 45 degrees overhead, thumbs toward the ceiling, forming a Y when viewed from above. You lift both arms off the mat by engaging the lower trapezius, hold briefly with shoulder blades pulled down and together, then lower slowly. Research confirms that the 45-degree prone arm elevation selectively activates the lower fibers of the trapezius better than most other bodyweight exercises (Arlotta et al., 2011; Cools et al., 2007).
The lower trapezius is the muscle everyone is missing. It sits between and below the shoulder blades and its job is to tilt and rotate the scapula so your arms can move overhead without impinging the rotator cuff. Weakness here is one of the most common causes of shoulder pain in lifters, desk workers, and overhead athletes alike. The prone Y raise is the most direct, equipment-free way to train it.
The key is the position: face down. When you stand and lift your arms at 45 degrees, the front delts and upper traps take over. Lie face down and the physics reverse — gravity now pulls directly against the lower traps. EMG studies on selective trapezius recruitment confirm the 45-degree prone elevation as one of the most effective lower trap activators available without equipment (Arlotta et al., 2011).
Quick Facts
| Starting Position | Prone (lying face down) |
| Arm Position | 45 degrees diagonal overhead, thumbs up |
| Primary Muscles | Lower Trapezius |
| Secondary Muscles | Rear Deltoids, Rotator Cuff, Rhomboids |
| Equipment | Bodyweight (mat optional) |
| Difficulty | Beginner |
| Part of Series | YTW Scapular Stability Series |
Step-by-Step: How to Do a Prone Y Raise
- Lie face down. Get on the floor face down (prone) on a mat. Extend both arms diagonally overhead at about 45 degrees from your body — halfway between pointing straight ahead and pointing straight to the sides. Thumbs point toward the ceiling. From above you form the letter Y.
- Set your position. Brace your core and lightly squeeze your glutes. Rest your forehead on the mat or gaze at the floor. Pull your shoulders down away from your ears.
- Lift both arms off the floor. Squeeze your lower trapezius to drive both arms upward. Keep arms completely straight throughout — the moment they bend, the lower trap disengages. The movement is small, even 3 to 4 inches of clearance is enough.
- Squeeze at the top. Actively pull your shoulder blades down and together. Hold 1 to 2 seconds. The work should be felt between and below the shoulder blades — if you feel it only at the top of the shoulders or traps, you are shrugging instead of retracting.
- Lower with control. Take 2 to 3 seconds returning to the mat. Touch down lightly and repeat.
Common Mistakes (And How to Fix Them)
Wrong Arm Angle — Too Straight (Becomes an I)
What it looks like: Arms point straight overhead instead of at 45 degrees.
Why it's a problem: Turns the Y raise into an I raise. Different muscle emphasis — the I targets more of the very lowest trap fibers and rhomboids, while the Y's 45-degree angle is what specifically hits the lower trap for scapular upward rotation.
The fix: Think of a Y on the wall. Your arms should split the difference between straight ahead and straight to the sides. Check in a mirror from above if possible.
Shrugging at the Top
What it looks like: Upper traps bunch up around the ears as the arms rise.
Why it's a problem: The upper and lower traps are essentially opponents in this movement. If the upper traps fire first, the lower traps never get the activation signal. You end up with a glorified shoulder shrug.
The fix: Before every rep, consciously pull your shoulders down toward your back pockets. Hold them there throughout the lift. If shrugging persists, reduce range until the pattern corrects.
Bending the Elbows
What it looks like: A bend develops at the elbow as the arms lift off the floor.
Why it's a problem: Shortens the lever, reduces lower trap demand, and partially converts the exercise into a row. Straight arms are non-negotiable.
The fix: Actively straighten your elbows before you start. Think "long arms." If you can't maintain straight arms through the set, stop and rest.
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Easier (Regression)
- Incline Y Raise. Lie chest-down on a low incline bench. The angle reduces the load on your arms, making the movement more accessible while training the same muscles.
- Isometric Y Hold. Lift arms to the Y position and hold for 10 to 20 seconds. Build endurance in the lower traps before adding reps.
Harder (Progression)
- Weighted Prone Y Raise. Hold very light dumbbells — 1 to 5 pounds is enough. The lower trap is a small muscle; don't go heavy. Prioritize the squeeze over the load.
- Extended Hold Y Raise. Hold the top position for 3 to 5 seconds every rep. Demanding enough without adding any weight.
- YTW Circuit. Flow from I raises to Y raises to T raises to W raises without resting. Full scapular warmup in one continuous sequence.
Programming Tips
- Sets x Reps: Beginner: 2×10–12 / Intermediate: 3×12–15 / Advanced: 3×15 with 2-second hold at top
- Rest Period: 30–45 seconds between sets
- Frequency: 2–4 times per week, or daily as a shoulder prehab warmup
- When in your workout: Before any pressing or overhead work. Part of the YTW warmup sequence.
Frequently Asked Questions
What muscles do prone Y raises work?
Prone Y raises primarily target the lower trapezius, with secondary work from the rear deltoids, rotator cuff, and rhomboids. Research on selective trapezius recruitment confirms that the 45-degree arm elevation in the prone position is one of the most effective ways to activate the lower fibers of the trapezius (Arlotta et al., 2011).
Why do Y raises lying down instead of standing?
The prone position changes the physics completely. When you stand and lift your arms, the front delts do most of the work. When you lie face down and lift them, gravity loads the lower traps directly — the same muscles that are consistently underactive in people with rounded shoulders or shoulder impingement.
Why are prone Y raises important for shoulder health?
The lower trapezius helps tilt and upwardly rotate the scapula during overhead arm movement. Weakness here contributes to shoulder impingement, poor overhead pressing mechanics, and chronic postural problems. Prone Y raises directly train this muscle in a way that standing exercises cannot replicate.
Do I need weights for prone Y raises?
No. Bodyweight is challenging enough for most people, especially when maintaining strict form with the full 2-second hold at the top. If the bodyweight version becomes easy, add very light dumbbells — 1 to 5 pounds goes a long way at this arm angle.
How is the Y raise different from the I raise and T raise?
All three are prone floor exercises in the YTW series. The I raise has arms straight overhead (0 degrees), the Y raise is at 45 degrees, and the T raise is straight out to the sides (90 degrees). The Y's diagonal angle is what best loads the lower trapezius specifically.