I've been doing C25K for about 4 weeks now, I'm pretty new to running and really enjoying the program so far!

I had a few weeks where I was away on business for a while traveling around so it's been a little more drawn out than I would have liked but over the last two weeks i've really cracked on with the program,

I completed week 3 last week with no issues but i've come to week 4 and it just seems really hard.
After the 5 minute warmup I started the first 3 minute jog which was not too hard, then walking. Then the 5 minutes running was pretty tough but I felt I could go on - but after the next 3minute run I just couldn't finish! I had to go to a light walking pace and just cool down.

Is it normal for one week to be so difficult compared with last week?

Would you suggest my next two runs this week I just do from week three and try again next week or should I have a go at week 4 again?

Thanks.

http://This message has been edited by iainr (edited Nov-12-2007).