I'm doing my first long trail race in January up on Orcas island in the San Juan Islands Washington state. This run has some pretty steep running both up and down. I have a good pair of trail shoes in the Mix Master 2 but I'm wondering if people have any advice for this kind of running either in the training or technique. I'm especially worried about the longer steeper down hill portions. I would really like to complete this race with my knees still working. Thanks for any and all advice!