Ok, need some advice - I started doing HIIT last week on the treadmill (just google searched a program of 30 second sprints, 1:30 walk) and now I have pain that runs pretty much the entire length of my shin bone (not the muscles) in both my legs when I walk or run. It seems like bike/elliptical is the only thing that isn't aggrevating it but I never feel fully worked out after using them. Any suggestions? I just bought gel arch support insoles to try out in my running shoes today when I work out but I'm starting to think that after a week's worth of hurting, I may have hurt something