Hi I was really worried about week 4 as well. I did just what TrishE suggested and slowed my pace right down when I began to struggle. I also kept telling myself that I could do it and wouldn't give up. Two things made a massive difference for me. One was getting proper running shoes and the other was working on my breathing. I did week 5 day 1 and made it through all the 5 minutes runs and was so proud of myself. Dreading day 3 though