A. Operate the computer should ensure that when using the keyboard wrist is flat is in the wrist and upper and lower, left, right in four directions of the angle formed by the smaller is better. Also not folding, neither to the left or to the right of torsion, twisting, so as to ensure that the wrist is always in a relaxed state, is not easy to fatigue.
B. Ensure that operate the computer when the elbow joint angle? On the upper arm and forearm angle inside? Point of greater than 90 degrees? Hole also is looked as the straight arm. In order to prevent nerve pressed elbow.Should try to ensure that the wrist is extended and the upper arm and elbow should be as close as possible to the body,
C operation of the mouse and keyboard operation requirements requirements: when the hand is placed in a similar mouse on. The wrist has more flexibility.