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Medicine

Biomechanics of the Lumbar Spine During Lifting

Quick fact

When you bend forward to lift an object, the compressive force on your lower back can be up to 10 times the weight of the object itself because the spine acts as a lever with a very short muscle arm.

Why this is interesting

You can lift a heavy box with your arms and feel fine, but bend over to pick up a pencil and throw your back out — how can something so light cause such damage? The answer lies not in the object's weight but in the hidden lever system of your spine.