In that case, you spend several hours laying down on somewhat comfortable bedding while Nume Rand hovers over you, jabbing needles into your skin and muscles. They are coated in some substance that burns tremendously when poked into your flesh. At some points, Vash has to help hold you down while Rand continues the procedure.
After he is done, you rest some... and your Strength is restored to 3.
But you also take 5 damage from the painful process.