After taking a week off to let my leg heal (I pulled a muscle in my calf, I think) I am back repeating week 2 and did my second run of it last night.
Thing is, it seemed even harder than ever and I was finding things like breathing hard to do and I'm wondering if I'm going too fast? My mile speed has been actually dropping but last night was the hardest it's been yet and I don't want to spoil things for myself
Anyone know a good way to tell if I'm going at the right speed?