I'm 37, ex TA. Going back in after a 10 year break, selection in 3 weeks. I was 18 stone and couldn't run back in july, now 16 stone, running 1.5 miles in 12 mins. My regular run is only 1mile, twice a week (monday and friday), with fartlec on a wednesday and tuesday and thursdays are bodyweight exercise, core etc. Anyway, I decided to up my distance last night to 2 miles, with a view to being comfortably a 3 mile runner by selection time. It went fine, better than my first post-christmas run last week, which was not pretty. But this afternoon, I hot a twinge in my lower left leg. It seems to be between my calf muscle and the bone, and extends to just below my calf. I'm wondering if its my achilles tendon? It seems to come on for 5 mins, then off for 10 or so. When I sat back on my haunches while bathing the little un, it set it off too. A work colleague said 'its cos you,re using muscles you've not used before' which as well as being patronising, is doubtful, as I know what lactic acid in muscles feels like. Its a little concerning. Any ideas? Any recommendations on treatment?