Most of the time, taking frequent breaks from repetitive tasks (like working on a computer) will help put you at a less risk for a repetitive strain injury. Additionally, you can avoid an RSI by standing up and stretching more often. We recommend looking at faraway objects from time to time instead of keeping your eyes glued to your computer screen, as well.
You can also lessen your risk of getting a repetitive injury through good health habits. These habits include taking breaks whenever you feel tired, using breathing techniques to relax your muscles, and performing regular exercise.