Artista if it makes you feel any better I only did 3 miles on the treadmill yesterday. Combined walking steep incline with running and I felt like poo today. I haven't run in probably a month. Did a shop ride this morning and about died. BUT, I'll keep doing my little bits of running here and there because it does keep me in best cardio shape and its great for bones. It will take a while for me to get comfy running again. It is a very slow process for me. Nothing 'natural' about it.