It is generally not a good idea to rest your hands while you type. If you chose to do this, use a padded surface or wristrest and keep your wrists m a neutral position. Avoid pressing down on your wrists and raising your fingers to type. Use the wristrest to rest intermittently when pausing during work. Avoid long nails.
Long nails create awkward finger postures.
Keep your thumb relaxed and in a curved position when you press the space bar, and move it gently. Switch thumbs periodically to use the space bar to avoid overusing one thumb. Avoid holding your ann out too far to the side when using a mouse, glidepoint, or trackball. This can cause pain under the shoulder blade, in the neck or down the arm. Avoid using a tight grip when holding a pointing device.