I've just completed day 2 of week 7 running for 25 minutes straight. When I completed the previous 20 minutes run in a previous week I was really surprised with myself that I completed it and felt like I still had more in the tank. I felt good about going into week 7. Although I completed it my legs during the run were really hurting and could have easily given up 10 minutes in. I did continue and finish but am really suffering. Any advise if/or when this is likely to improve? Is it best to have a rest? or persevere?