I have been running now for about 18 months. Recently I have increased to four times a week running x 5k and if I can one would be a 10k. My legs have been struggling though even doing 5k but I have kept going. I am working full time so if I was to run today, it was a silly o clock 5.30 am stumble. I wasn't aiming for any speed but just to do 5k. I couldn't believe my eyes when I did it in 29 minutes! Wow, how did I do that?