Hip hinge pattern

#What the pattern is responsible for

Hip extension against a load, with the hamstrings and glutes working at a long length throughout most of the range. The RDL specifically isolates the hip-hinge component without the additional knee-extension and floor-pull demands of a conventional deadlift.

#Tier 1 — Equivalent

RDL ↔ Stiff-leg deadlift. Nearly identical hamstring and glute stimulus; the stiff-leg version simply starts from the floor rather than a hang position. Interchangeable.

Good morning, loaded moderately, trains the same hip-hinge pattern with the load positioned on the back rather than in the hands. A genuine equivalent for the hip-extension stimulus; the trade is a different balance and spinal-loading demand.

#Tier 2 — Close, with a stated cost

Cable pull-through. Trains the same hip-extension pattern at the same long muscle length, at typically lighter absolute loads because the cable geometry limits how heavy you can realistically go. Good option when lower-back fatigue from barbell hinging is the limiter — the cable removes almost all spinal loading — but do not expect it to progress in load the way a barbell RDL does.

45° back extension (weighted). Trains hip extension at length; the range of motion is somewhat shorter than a full RDL and the resistance curve is different (bodyweight-plus-plate rather than a barbell moving through a full hinge). A genuinely useful accessory, not a full replacement for the primary hinge movement.

#Tier 3 — Last resort

Seated leg curl, substituting for the knee-flexion component only. This does not replace hip-extension work — it replaces the other hamstring job (see the hamstrings anatomy lesson). If a hinge movement is genuinely off the table due to lower-back injury, pairing a leg curl with a cable pull-through covers both hamstring functions without any spinal hinge loading at all.

#If it's your lower back, specifically

The hinge pattern is the most common source of lower-back substitution requests, and it is usually a bracing or hip-mobility problem rather than a reason to avoid hip extension work entirely. Try the cable pull-through first — it isolates the hip-extension pattern almost entirely from spinal shear — before concluding the whole movement pattern needs to go.