How can I prevent getting arthritis?

Move and Stay thin. Maintaining a healthy weight and moving your joints everyday is a good way to prevent arthritis. Exercises that allow your joints to maintain their full range of motion are the best. Don't forget your small joints such as your fingers and toes too.
Several things! Get proper nutritional support, exercise regularly, and maintain ideal weight. Avoid joint trauma, although accidents happen. And hope that your family history, over which you have no control, is not rife with arthritis, since there is a genetic component!