You should incorporate curb running into your workouts.
Curb running has been proven to increase leg strength and is especialy helpful in equalizing leg strength discrepancies.
Curb running is done by running with one foot landing in the gutter of the street, and the other foot running along the top of the curb adjacent to the gutter. Thus one leg is constantly having to lift your body weight up about 6-8 inches more than the other. This strengthens almost all of the leg muscles.
If your legs are equally strong, you would want to run on the curb for equal times for each leg. If one leg is weaker than the other, give it a little more "curb time".
Start gradually and build up, otherwise you run the risk of injury. Good luck!
Jurgen Ahert