Ok I am up to 9 miles now and am enjoying a healthy mix of short runs and faster runs but 2 days ago I ran up a big hill 4 times and walked down. I felt absolutely great and ran home 2 miles from the hill feeling very strong. within 2 hrs my lower back is killing, I could hardly walk.
My question is, are the lower back muscles just experiencing the same as say my calf muscles did to start? Will they repair and be stronger? Or is there something untoward deep down? I am a heavy 14.5 st and only 5'8" but am getting stronger in all areas. It is slightly better today and much worse when I have been sitting?
Any thoughts please