It is important to keep up your circulation to remove waste products from the blood stream before they can build up. If you are double-jointed, when you type your finger joints tend to collapse instead of holding firm. This makes your wrists bounce up and down more than they should. Weight Weight is a risk factor. The muscles of overweight people must support a greater load.
Overweight people have to work harder to hold their forearms up to the keyboard.
If you are out of shape, your muscles do not work at an optimum level, so some muscles have to work harder than others. Typing should work your back, shoulders, arms and hands, not just the forearms and fingers. Women Women are more at risk than men. Females tend to work at jobs that put repetitive strain on their wrists. They also tend to have weaker muscles.