I live in a reasonably hilly area. I cannot run more than a mile on flat ground. At some point, generally more than once for a five miler, I encounter hills, .... steep, shallow, the lot.
Will I suffer over a period of years from doing so much hard training? At the moment, I really boost my times, because of all the strength training that I naturally incur, and have recently produced PBs (in my late 30s).
Does anyone have the same surrounding undulating problems?