Single-arm Romanian deadlift

What it is

Stand on both feet, hip width, holding a single dumbbell or kettlebell in one hand at your side.

Hinge as you would in a Romanian deadlift, letting the weight travel down the front of that leg. Keep your shoulders square and your hips level — the weight will try to pull one shoulder down and rotate you towards it.

Drive the hips forward to stand. Do a set on one side, then swap.

What it demands

The hinge pattern, plus a demand nothing symmetrical has: resisting rotation and sideways bending under load.

A weight in one hand is an unbalanced load. The trunk has to stop it turning you, which is the job of the obliques and quadratus lumborum on the opposite side. In hinge terms this is a two-legged movement; in trunk terms it is a single-sided one.

Grip on one hand, at the same total load a two-handed version would split.

What usually goes wrong

Letting the shoulder drop. The loaded side sinks and the spine side-bends. It feels like reaching further; it is the trunk giving up.

Rotating open. The unloaded shoulder drifts backwards. Easiest to spot from behind, or by hinging with your back near a wall and noticing if you brush it.

Treating it as a single-leg movement. Both feet stay planted and evenly weighted. The single-leg Romanian deadlift is the balance version; this one is the anti-rotation version, and confusing them wastes both.

Loading it too heavily too soon. The trunk demand outruns the hip demand quickly.

Where it sits

The bridge between hinging and trunk work, and a good illustration of a general principle: making a load uneven changes what an exercise trains far more than making it heavier does.

It shares that property with the suitcase carry, which applies the same one-sided load while walking rather than hinging.