[vemv]

Nature doesn't require us to lean on armrests, desks or such - in fact there are almost no flat (or cushioned) surfaces on nature.

Evolutionarily it would't make sense if the human body wasn't 'self-contained' - requiring no external tools to work comfortably.

Your normal posture is to have the arms relaxed, or with a moderate amount of tension by keeping them lifted a reasonable amount of time, and variating the posture as well.

A well-developed hunter/gatherer would definitely have arms strong enough to type this way without getting particularly tired.

So what we modern humans ought to do is to keep the arms strong (by exercising), and to not compensate tiredness with artificial mechanisms.

I'm aware that this argumentation is somewhat dubious (and probably I failed to express it properly), but as a simpler experience report, I've worked this way 4+ years without trouble. First days will suck though.

[tjoff]

I would need more convincing than that. Nature doesn't have keyboards.

Static postures are seen as something very bad in ergonomics, muscles are not adapted for that and wear is problematic.

I've used supports for 20+ years without trouble. First day didn't suck either.

[vemv]

Lifting your arms doesn't mean keeping them in a static position. They are lifted when you're typing; else they lean on your legs (much better than using some kind of cushion/surface, since your legs don't compress your wrists). Also, one can vary the arms' angle/etc during the day.

The bad part about wrist/arm rests is - very likely they compress various layers of your body, and they force you to contort your wrists to type (because you want to reach the keyboard while some other part of your body is stuck 'resting').

[tjoff]

Maybe I overestimate how much I use the keyboard but I still see hours on straight where I would not want to move my hands away from the keyboard. You don't need to reach for the keyboard due to supports, you are resting on the home row.

Yes, movement is important and one should take breaks but that is something one should do regardless of posture. I see how lifting hands can improve that but it has to be balanced against the negatives.

If moving a hand to use the mouse is seen as a big pain point I have a hard time to see how one would rest unused hands on the legs? Underneath the table?

[deno]

When you bend your arms at 90° where are your palms? With proper posture/keyboard height they should be over the keyboard. If you’re sitting straight it’s natural to bring your keyboard to the edge of the desk. But if you prefer to be under the desk then just rest on the desk.

I made a really quick sketch some time ago maybe it helps: http://svgur.com/s/7e6

That wrist angle on the green dude is very exaggerated, the point was to show that the fingers are in their natural positions, rather than curled, which is what happens when your wrists are glued.

EDIT: Also just look where the piano lady is resting her hands.