C25K help

I am on my second startup with this program. I got all the way to week 6, day 3, and then failed....I could not jog for 25 minutes....I kept repeating week 6 day 1, which was challenging, but doable. I then took two weeks off for medical reasons, and reset the program this morning. Challenging, but totally doable up to week 6. I need to get past that hump....so here I go again.