When removing material, we start with a coarse tool, whether that be a hatchet, coarse sandpaper, or a large chisel. From there, we move to finer and finer tools, trading our hatched for a knife or plan, swapping out the belts on the grinder for finer grits, etc. When we work with our body, we should follow the same principle. Start with the largest muscle group you can for any given action and only go as fine as is absolutely necessary. Swordfighting, blacksmithing, and even handwriting all come far more from the back muscles than they do the shoulders, chest, and wrist. These larger muscle groups fatigue more slowly, and react more quickly to our commands than the smaller finer muscles in our extremities. One can write for hours at a time with the Palmer method, a style of handwriting that involves gross motor movement at the elbow and shoulder while keeping the wrist and fingers almost entirely immobile. When hammering or hatcheting, using the back muscles to lift the tool and let its weight drive it down into the work is far more sustainable than trying to push the hammer into the steel. When swinging the longsword, we use the back muscles, and our fingers grip the handle only to connect it to those back muscles.