I finished Couch to 5K in the summer and since then have been trying to build up both speed and distance. However, every time I seem to be making some progress, I then come down with a cold virus which stops me running for a week or so. Then I have to start building up my running again and the next bug hits. I've had a cold and then a fluey bug in the last three weeks, and I'm getting frustrated. I feel as though I'm taking two steps forward and three steps backward.
Could the running affecting my immune system? I thought that running would make me healthier! Does anyone else have this problem, and can anyone offer some advice? Thanks.