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How to do the Barbell Stiff Leg Good Morning

CoreAbsBarbellIntermediate

The barbell stiff leg good morning is a deceptively demanding movement that forces your entire posterior chain and core to work as one integrated unit under a loaded hinge pattern. Master this lift and you build the kind of deep spinal stability that transfers to every heavy compound movement you train.

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Muscles worked

Primary
AbdominalsObliques
Secondary
Hip flexorsLower back

Step-by-step

  1. Set the barbell across your upper traps, stand hip-width apart, and brace your abs hard as if absorbing a punch before you move an inch.
  2. Maintain a slight fixed bend in the knees, then hinge at the hips by pushing them straight back while keeping your chest tall and spine neutral throughout the descent.
  3. Lower your torso until it approaches parallel to the floor or until your hamstring flexibility stops you, never allowing your lower back to round under load.
  4. Drive your hips forward to return to standing, squeezing your glutes at lockout while keeping core tension locked in from start to finish.

Common mistakes

  • Rounding the lower back under load which compresses the spine dangerously, fix this by reducing the weight and practicing the hip hinge pattern with a dowel rod along your spine until neutral position becomes automatic.
  • Treating it like a squat by bending the knees excessively, fix this by keeping a minimal soft bend locked in place throughout the rep so the hamstrings and posterior chain carry the true demand of the movement.
  • Looking up aggressively to compensate for a collapsing torso, fix this by keeping your gaze a few feet ahead on the floor so your cervical spine stays in line with the rest of your neutral back position.

Pro tip — Before each rep actively pull the bar apart with your hands using lat engagement, this external rotation cue locks your thoracic spine into rigid extension and prevents the upper back collapse that kills both safety and core tension in this lift.

Sets & reps by goal

Build muscle3–4 sets × 6–10 reps
Get stronger4–5 sets × 3–6 reps
Lose fat / tone3 sets × 10–12 reps

Rest: 2–3 min between sets (60–90s on lighter days).

More Core exercises

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