I've just finished W3R3,and due to start week 4 at the weekend. Most posts I've read are concerned about week 5 (as am I), but I'm also a bit concerned about W4. I manage the 3 min runs OK, but 5 minutes seems a long time! Not helped by the fact I've chosen the coldest March for 50 years to start running!! I've changed my route during the recent high winds so that I run against the wind (and horizontal sleet/snow) at the start, and have it behind me on the way back. That's helped a bit.