Suitcase carry

What it is

Take one heavy dumbbell or kettlebell in one hand, exactly as you would a suitcase. Stand tall and walk.

Do not lean away from it, and do not let it pull you towards it. Stay vertical. Walk a distance, set it down, swap hands, repeat.

The visual test is simple: someone watching from in front should not be able to tell which hand the weight is in, apart from by looking at it.

What it demands

The same grip and postural endurance as the farmer's carry, at the same load in one hand.

And the thing that makes it a different exercise: resisting sideways bending, continuously, for the whole walk. The load is trying to fold you towards it, and the muscles on the opposite side stop it — the obliques and quadratus lumborum.

That is the same demand as a side plank, applied while you walk, which means the trunk has to hold position while your legs move underneath it. That combination is closer to how the trunk is used in life than any static hold.

What usually goes wrong

Leaning away from the weight. Counterbalancing by tipping. It makes the walk easier and removes the exercise.

Being pulled towards it. The other failure, and it means the weight is too heavy.

Hitching the hip up on the loaded side.

Not doing both sides equally. One side is usually noticeably worse, and matching the weaker one is the point.

Where it sits

The clearest single illustration of a principle worth internalising: an uneven load changes what an exercise trains more than a heavier load does. Nothing here changed except which hands hold the weight, and it stopped being a grip exercise and became a trunk one.

It shares that with the single-arm Romanian deadlift, which applies the same one-sided load to a hinge.