The leverage behind a shoulder carry
A person’s weight does not just press downward; its position also creates a turning force on the carrier. The farther the load sits from the carrier’s body, the harder the back and arms must work to keep the torso from tipping forward. In mechanics, that turning effect is called torque.
A shoulder carry keeps the load relatively close, reducing that leverage. The carrier can then support more of it through the hips and legs, which are better suited to producing force than the arms alone. The arms still matter: they help secure the person and stop the load from shifting.
The tradeoff is balance
The load sits high and is often uneven, so the carrier must lean and adjust to keep both people’s combined center of mass—the point around which their weight balances—over their feet. A small shift can change the effort needed to stay upright. The carry may save arm strength, but it does not make a person weightless or remove strain from the back, knees, and shoulders.
That is why the method works best as a short-distance way to move someone, not as a magic shortcut for carrying any person safely. Its advantage is simple: bring the load in close, and the legs can do more of the work before the arms give out.
