I recently began running hill sprint but I'm not sure I have the right kind of hill.
I run up a raised area near the side of a highway overpass. It is extremely steep (approx 40-45 degrees) and it only takes me around 5-8 seconds to make it to the top. I don't get out of breath doing it but it does drive my pulse through the roof and completely trash my legs. I'm worried that I may not be reaping all of the benefits of hill sprints because it is too short/steep and that the incline may be bad for knees/ankles.