Had a disappointing time this morning. I'm on week 5 mix 3 of c25k. Was suppose to run 20 min without stopping and I couldn't do it. I can't decide whether to continue repeating this particular mix or start this week over fresh with mix 1 and build back up to mix 3. Mix 1(Tuesday) is a brisk 5 min warm up walk; 5 min jog; 3 min walk; 5 min jog; 3 min walk; 5 min jog. Mix 2(Thursday) isa brisk 5 min warm up walk; 8 min jog; 5 min walk; 8 min jog. Mix 3 is 5 min brisk warm up walk followed by 20 min jog- no walking. Any thoughts or recommendations?