You might run six sets of two efforts in a session. When you can handle hills well in training, they will seldom be a problem in races. Tuck in behind someone, get pulled up the hill, then find that other gear you ve been practicing as you accelerate over the top. Hills will improve your racing speed by building strength in the quads, hamstrings, buttocks, calves and back. Hills increase your anaerobic efficiency.
Bigger quads result in fewer knee injuries.
Enjoy the hill. Always enjoy the hill. Doing a lot of distance running can decrease your stride length. Even though you will be doing repetitions, 200s etc. Just remember to exaggerate the knee lift and the arm swing, while pushing off with the toes and calf muscles.