I am on Week 4, I did run 1 and really struggled. I was fine (almost) for the first half but had to give up half way through the second 3minute run. I walked for a while and then managed to complete the final 5 minute run. I am struggling with strain on lower inside leg which is not helping. I did this run last Friday and haven't run since (now Tuesday). I am seriously having problems getting motivated. Should I try again with Week 4 or go back and do some more of week 3! It doesn't seem to be so much my legs as my breathing/stamina.