I have just got back into running after a fallow year (due to acute laziness syndrome) and am having real trouble with incredibly tight and painful peroneus muscles ( or thereabouts). I'm a big chap currently doing the early stages of the couch to 5k plan. My problem is that the outside of my lower legs are so painful I can't finish the runs/walks, I can barely hobble back through the front door. The pain goes fairly quickly when I take a load off, it is much worse on my right side than my left and oddly it isn't as bad when I'm running compared to the interval walks. Any ideas of how to alleviate the pain? Any exercises to strengthen the muscles?