I have only recently started doing a strict fitness regime. I am on week 3 of main programme. When I first started jogging...I had no pain in calfs. I changed my trainers about week 1-2 and first time I wore them I was in agony with calfs on a 2.5 mile run. So...I reverted back to my old trainers. I went running with these but still the pain was there. It happened again today and yesterday. I don't want it to start putting me off running as I need to do it and I enjoy it. I can cope with my lungs feeling they want to burst or feeling the need to puke as I push through that...but the calfs are driving me insane! I asked a PTI, he rekons going to running shop for analysis. However I know it will help for other reasons but I dont think it will stop calf pain?? IMPORTANT PART- I used to be a sprinter. When I run quick (interval trg)or sprint I dont have a drama. PFT best effort pace does not effect me either. It is a steady pace jog (60-70%) that makes them hurt. I think its lactic acid?? Does anyone know how to get rid of it or will it go in time? Any advice/experience is great. I have tried reps on steps going from tip toe to pushing heel down which KILLS when I do this. Also, Im female, 23, of athletic build. Been out of hard phys on reg basis for a while. Cheers in advance guys!