I had the problem despite of arm rests. Keeping the hands in a lifted position was the problem, moreover even a slightly bad pose caused my hands to bend downwa

I had the problem despite of arm rests. Keeping the hands in a lifted position was the problem, moreover even a slightly bad pose caused my hands to bend downwards to reach the keys, which is also suboptimal. Armrests themselves are not optimal for supporting the arm because the surface area is small and hence the pressure is high.