Rear Delts Training for the Slim Woman: 135–160 lbs, Recomp Phase
Rear Delts Training for the Slim Woman: 135–160 lbs, Recomp Phase
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If you are a woman at 135 to 160 pounds whose shoulders round forward – in photos, in mirrors, in your natural resting posture – the posterior deltoid is the muscle most directly responsible for fixing that, and it is almost certainly undertrained relative to everything else you are doing.
I’m Xavier Savage, a personal trainer based in Houston, Texas. The rear delt is the most undertrained shoulder muscle in women’s fitness programs without exception – it receives zero stimulus from pressing movements, is never covered by mainstream workout plans, and its underdevelopment is directly responsible for the rounded, caved‑in shoulder appearance that no amount of front delt or chest work will correct. I address this in every Slim archetype program I write, both in my Houston gym and through XPL online coaching across the US, Canada, and the UK.
Rear Delt Anatomy
The posterior deltoid is the back portion of the three‑part deltoid muscle. It originates along the spine of your shoulder blade (the bony ridge across the back of your scapula) and inserts at your upper arm alongside the other deltoid heads. Its function is to pull your arm back – shoulder extension – and externally rotate your shoulder (rotating your upper arm outward).
Its development creates the three‑dimensional shoulder appearance visible from the side: the full, rounded cap of a developed shoulder requires all three heads, and the rear portion is the one that most women completely lack. Without rear delt development, your shoulder profile appears flat from the side and your arm hangs in internal rotation, contributing to the rounded‑forward appearance.
Body Shape and Rear Delt Priority
Pear Shape
Upper body development is your structural priority. Rear delt training should be high volume – 4 sets twice per week – to develop the three‑dimensional shoulder appearance that widens and develops your upper body.
Hourglass Shape
Rear delt development enhances your natural balance. Three‑four sets twice per week.
Inverted Triangle Shape
Your shoulders are already wide. The goal is depth and three‑dimensionality, not width. Rear delt development creates the back‑of‑shoulder fullness visible from the side. Moderate volume – three sets twice per week.
The Exact Rear Delts Protocol
Exercise 1: Face Pull
Set a cable rope at face height. Grip both rope ends with palms facing down. Step back for tension. Pull the rope toward your face while simultaneously pulling the rope ends apart – elbows flare out and upward. Finish with elbows at or above shoulder height, hands beside your head. Hold for 1 second. Return slowly.
Sets: 4. Reps: 15. Rest: 60 seconds. Starting weight: 20 pounds. Progressive overload: add 5 pounds monthly – this is a small muscle trained for endurance as much as strength. Common mistake: elbows dropping below shoulder height, removing rear delt emphasis.
Exercise 2: Dumbbell Rear Delt Fly (Bent Over)
Sit at the end of a bench or stand bent forward at your waist until your torso is near parallel to the floor. Let both arms hang straight down, a light dumbbell in each hand. With a slight bend in your elbows, raise both dumbbells out to the sides – the movement is horizontal abduction, arms moving away from your body while parallel to the floor. Do not raise above shoulder height. Lower slowly.
Sets: 3. Reps: 15. Rest: 60 seconds. Starting weight: 8‑10 pounds per hand. Progressive overload: add 2 pounds when all reps are completed with no torso rocking. Common mistake: raising the dumbbells too high or using body momentum – keep your torso fixed, movement only at the shoulder joint.
Exercise 3: Band Pull‑Apart
Hold a resistance band with both hands in front of you, arms straight, at shoulder height. Pull the band apart by moving both hands simultaneously outward and backward until the band touches your chest. Hold for 1 second. Return slowly. This exercise trains your rear delts, rhomboids, and external rotators simultaneously and can be done anywhere.
Sets: 3. Reps: 20. Rest: 45 seconds. Starting resistance: light band. Common mistake: allowing your elbows to bend – keep arms nearly straight throughout.
Timeline
Week 2: Shoulder posture begins naturally correcting – the externally rotated position becomes easier to maintain.
Week 8: Three‑dimensional shoulder appearance visible from the side.
Week 12: Natural resting shoulder position is neutral rather than internally rotated.
For complete shoulder development, see the shoulders protocol and the side delts protocol. Take the XPL Archetype Quiz to confirm your phase.
I train clients in person in Houston, Texas and work with people across the US, Canada, and the UK online through XPL. Take the XPL Archetype Quiz to get your exact protocol, or visit xperformancelab.com/plans-pricing to work with me directly.
The standards behind the standards. — Xavier Savage, XPL Xesthetic Performance Labs, Houston, TX
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Xavier Savage
Founder, XPERFORMANCELAB
I do not shape muscle. I shape structure. The person you become is the person you construct.
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