I was too eager to make start on week 5 having repeated week 4 once and feeling good about the progress I had made.
I felt like I was coming down with a cold .. a bit feverish and funny throat etc. but I decided to go out anyway.
First two 5 minutes went pretty well actually but then as I was taking my second walking break I started to feel fever aches all over my body and lethargy started to kick in .. I still managed to complete the last 5 minutes and kept the pace from the previous two segments; so it wasn't terrible.
By the time I got home I could barely walk though, was feeling so weak, nauseous and feverish. As I stretched I felt really lightheaded so I raised my legs up to force the blood into my torso which helped.
Needless to say I felt miserable and didn't get a good night sleep either.
Been following c25k for almost 6 weeks now and it's the first time I didn't enjoy the run.
Anyway, lesson learnt, don't go running with a cold.