I just finished week 7 of C25k and this past week was freaking rough. I fight with myself more than halfway though between wanting/needing to stop. I feel great at the end and am so proud of myself but geez, just going from 22 to 25 minutes seemed like a huge jump.
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Re: Why isn't this easier?
For the longest time starting out I would do run/walk intervals. I thought I just couldn't run a whole mile without stopping. Then 1 day at the gym this really fit woman I had been chatting with in the locker room took the treadmill next to me. I was embarrassed for her to see me walk so much, so I ran my workout straight. I surprised myself that I was able to do it.
I ended up joining a running group. Myself and a couple of other slow pokes would always run and chat. We always finished the runs last, but it became a really fun and easy activity. Now I can run just about any distance, no problem.
I think it's mostly mental and about building up your endurance.