Seated Good Mornings vs Stiff Leg Barbell Good Morning

Compare target muscles, equipment, difficulty, movement type, and secondary muscles for Seated Good Mornings and Stiff Leg Barbell Good Morning.

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Seated Good Mornings vs Stiff Leg Barbell Good Morning is a matchup between two advanced barbell hinge variations that both load the erector-spinae. You’ll get clear, practical guidance so you can pick the better tool for your goals: technique cues, biomechanics (length-tension and force vectors), rep ranges (6–12 for strength, 8–15 for hypertrophy), injury risk, equipment needs, and programming tips. Read on to learn which movement to prioritize and how to execute each to maximize spinal extension and posterior-chain development.

Exercise A

Seated Good Mornings

Target Erector-spinae

Equipment Barbell

Body Part Back

Difficulty Advanced

Movement Compound

Secondary Muscles

Glutes

Exercise B

Stiff Leg Barbell Good Morning

Target Erector-spinae

Equipment Barbell

Body Part Back

Difficulty Advanced

Movement Compound

Secondary Muscles

Glutes Hamstrings

Muscles used

Listed target and secondary muscles, shown on the body. Locations, not activation or strength scores.

Target
Secondary
Not highlighted

Seated Good Mornings

Front

Back

Target: Erector-spinae
Secondary: Glutes

Not shown on diagram: Erector-spinae. These labels do not identify a precise region on this map.

Stiff Leg Barbell Good Morning

Front

Back

Target: Erector-spinae
Secondary: Glutes, Hamstrings

Not shown on diagram: Erector-spinae. These labels do not identify a precise region on this map.

Grey does not mean a muscle is unused. The diagrams show only the mapped catalogue labels.

Attribute	Seated Good Mornings	Stiff Leg Barbell Good Morning
Target Muscle	Erector-spinae	Erector-spinae
Body Part	Back	Back
Equipment	Barbell	Barbell
Difficulty	Advanced	Advanced
Movement Type	Compound	Compound
Secondary Muscles Different	Glutes	Glutes, Hamstrings

Visual Comparison

An illustrative 1–10 profile derived from catalog difficulty, equipment, and listed-muscle fields—not measured performance or muscle activation.

Key Differences

Both exercises target the Erector-spinae using Barbell. The catalogue does not establish which exercise is better for an individual goal.

Muscle comparison

Shared target muscles

Both exercises primarily load the erector-spinae through a hip-hinge pattern that demands strong isometric control of spinal extension. Electromyography and biomechanical models show similar peak erector activation when trunk flexion reaches ~60–90° from vertical, but the exact challenge differs: Seated Good Mornings isolate the lumbar extensors more by fixing the hips, increasing local lumbar moment arm; Stiff Leg Barbell Good Mornings distribute load across lumbar erectors and hip extensors (glutes and hamstrings) during the hinge.

Secondary muscle differences

Seated Good Mornings recruit the glutes as stabilizers but limit hamstring length change because the hips are fixed against a seat—so hamstring contribution is low. Stiff Leg Barbell Good Mornings actively load the hamstrings and glutes, producing greater stretch under load in the hamstrings (longer length-tension range) and higher hip-extension torque.

Muscle involvement analysis

In Seated Good Mornings the erectors work harder in spinal extension through greater lumbar flexion and hold the trunk isometrically while hips are pinned. In Stiff Leg Good Mornings the erectors and hamstrings share the work: erectors control trunk flexion while hamstrings generate concentric hip extension; peak hamstring tension occurs near 20–40° hip flexion and the erectors ramp up as trunk angle increases.

Equipment and setup

Seated Good Mornings: setup

Seated Good Mornings require a barbell (rack to load/unload), a sturdy bench or box set to a height that lets your thighs support the hips, and safety pins or spotters if working heavy.

Stiff Leg Barbell Good Morning: setup

Stiff Leg Barbell Good Morning needs only a barbell and open floor space; a rack helps for loading but you don’t need a bench. A power rack with pins is recommended for heavy sets.

Access and practicality

Stiff Leg Barbell Good Morning — it requires less setup and can be performed anywhere you have a barbell, while Seated Good Mornings need a stable seat/bench and more careful loading.

Learning and progression

Learning the movements

Stiff Leg Barbell Good Morning is easier to learn because it uses a natural hip-hinge pattern that transfers from Romanian deadlifts; coaches can teach it with a PVC dowel and minimal cues. Seated Good Mornings demand precise pelvic positioning and trunk bracing, so the learning curve is steeper.

Progression considerations

Stiff Leg Barbell Good Morning offers broader progression: increase load, increase ROM (block deficits or elevated toes), or add pause reps and tempo work. Seated Good Mornings progress by load and tempo but have less ROM variability due to the fixed hips.

Limitations and precautions

Both carry elevated risk if form breaks, but Seated Good Mornings pose higher lumbar shear risk when spinal flexion increases without hip mobility—incorrect bracing can raise compressive/shear forces by ~10–20%. Stiff Leg Good Mornings risk hamstring strain if you force deeper ROM without control, but proper hip hinge and neutral spine lowers lumbar shear.

Pros & Cons

Seated Good Mornings

+ Pros

Greater isolation of lumbar erectors for targeted spinal-extension strength
Easier to control pelvis position and limit hip torque
Useful as an accessory for improving lockout and posture under load
Allows heavy loading without maximal hamstring fatigue

− Cons

Requires bench/seat and careful setup
Higher local lumbar shear if technique or bracing fail
Less hamstring development and carryover to hip-dominant lifts

Stiff Leg Barbell Good Morning

+ Pros

Stronger posterior-chain transfer — loads hamstrings and glutes as well as erectors
More accessible — minimal equipment and simple setup
Greater ROM and stretch-mediated hypertrophy potential for hamstrings
Easier to integrate with deadlift/hinge progressions

− Cons

Places more demand on hamstring flexibility and control
Can round the spine under fatigue if bracing fails
Heavier loads increase technical breakdown risk for inexperienced lifters

When Each Exercise Wins

For muscle hypertrophy: Stiff Leg Barbell Good Morning

Stiff Leg Good Mornings produce a larger stretch and active lengthening in the hamstrings plus substantial erector loading, giving a wider stimulus for posterior-chain hypertrophy. Use 8–15 reps with controlled 2–3 second eccentrics to exploit length-tension relationships.

For strength gains: Seated Good Mornings

Seated Good Mornings isolate spinal extensors and let you load the lumbar erectors more directly, which helps increase spinal extension strength and tolerance to heavy trunk flexion. Work in 4–8 rep ranges with tight bracing and progressive overload.

For beginners: Stiff Leg Barbell Good Morning

Stiff Leg Good Mornings teach the hip-hinge that transfers to deadlifts and swings; they’re simpler to cue (hip back, neutral spine, soft knees) and can be scaled with lighter loads or Romanian deadlift regressions.

For home workouts: Stiff Leg Barbell Good Morning

Stiff Leg Good Mornings require only a barbell and floor space, making them practical for home setups. You can progress with bands or tempo without needing a bench or rack modifications.

Frequently Asked Questions

Can I do both Seated Good Mornings and Stiff Leg Barbell Good Morning in the same workout?

Yes — but sequence matters. Do the more technical, heavier variation first (usually Seated Good Mornings for spinal-strength focus), then use Stiff Leg Good Mornings as a secondary volume exercise with lighter load or higher reps to target hamstrings and endurance.

Which exercise is better for beginners?

Stiff Leg Barbell Good Morning is better for beginners because it reinforces the hip-hinge and transfers to deadlifts. Start light, practice neutral spine and a 2–3 second eccentric, and progress only when form stays consistent.

How do the muscle activation patterns differ?

Seated Good Mornings bias lumbar erectors by limiting hip motion, increasing spinal extensor torque; activation peaks as the lumbar spine flexes. Stiff Leg Good Mornings distribute load between erectors and hamstrings — hamstrings reach peak tension during the stretched portion (roughly 20–40° hip flexion) while erectors stabilize the trunk throughout.

Can Stiff Leg Barbell Good Morning replace Seated Good Mornings?

They are not exact substitutes. Stiff Leg Good Mornings can replace Seated Good Mornings if your goal is posterior-chain hypertrophy and transfer to deadlifts, but use Seated Good Mornings when you need targeted lumbar-extensor strength or to rehab/strengthen a weak lockout.

Comparison Summary

Both movements are advanced and valuable, but choose based on the adaptation you want. Pick Seated Good Mornings when your priority is isolating and strengthening the lumbar erectors and improving spinal extension under load—train with heavier sets (4–8 reps), tight bracing, and slow eccentrics. Choose Stiff Leg Barbell Good Mornings when you want broader posterior-chain development and hamstring stretch-mediated hypertrophy—use 6–12+ reps, tempo eccentrics, and mindful hip-hinge mechanics. If you can, rotate both across phases: a 6–8 week block of seated work for spinal strength, then 6–8 weeks of stiff-leg emphasis for hamstring growth and carryover.

Exercise instructions

Steps from the exercise catalogue. Read the full sequence before starting.

Seated Good Mornings

Set up a box in a power rack. The pins should be set at an appropriate height. Begin by stepping under the bar and placing it across the back of the shoulders, not on top of your traps. Squeeze your shoulder blades together and rotate your elbows forward, attempting to bend the bar across your shoulders.
Remove the bar from the rack, creating a tight arch in your lower back. Keep your head facing forward. With your back, shoulders, and core tight, push your knees and butt out and you begin your descent. Sit back with your hips until you are seated on the box. This will be your starting position.
Keeping the bar tight, bend forward at the hips as much as possible. If you set the pins to what would be parallel, you not only have a safety if you fail, but know when to stop.

Read remaining steps for Seated Good Mornings

Pause just above the pins and reverse the motion until your torso it upright.

Stiff Leg Barbell Good Morning

This exercise is best performed inside a squat rack for safety purposes. To begin, first set the bar on a rack that best matches your height. Once the correct height is chosen and the bar is loaded, step under the bar and place the back of your shoulders (slightly below the neck) across it.
Hold on to the bar using both arms at each side and lift it off the rack by first pushing with your legs and at the same time straightening your torso.
Step away from the rack and position your legs using a shoulder width medium stance. Keep your head up at all times as looking down will get you off balance and also maintain a straight back. This will be your starting position.

Read remaining steps for Stiff Leg Barbell Good Morning

Keeping your legs stationary, move your torso forward by bending at the hips while inhaling. Lower your torso until it is parallel with the floor.
Begin to raise the bar as you exhale by elevating your torso back to the starting position.
Repeat for the recommended amount of repetitions.

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