Stuck in Week 4 now

I am sincerely trying to push myself and I see the results more in speed than in run length. I can do the 4 minutes at the start fairly easily, but the 6 minutes is kinda a mental block for me. I have been doing 2 minutes run, 2 walk, 2 run. Then usually I can do the final 4 minutes run, but today was not a good day for that. What I find is that my calves are getting so tired and sore... stiff maybe. HEAVY feeling. And it's hard to push through that. I am pushing through it to get to the numbers above. I can't imagine 6 whole minutes of it.

From what I have read on beginning runners, it seems that my muscular and skeletal system need to adjust to the new activity. My breathing is better (which tracks with what the info says too - your respiratory systems adapts to running faster than the rest of your body). I guess I need to just stay the course and this will improve. It doesn't HURT, it's just.... very uncomfortable.

The other thing it might be is that I am not giving myself enough recovery time between runs and this might just be the case. I am running every day (albeit, just a bit). I ordered Your Shape Fitness Evolved 2012 so maybe I can start doing that on my cross training days. I am trying to follow Hal Higdon's Half-Marathon app as far as on/off days. It doesn't seem like enough to only do C25K 3 days a week, so I admit that I have been doing it more. Maybe it is too much too fast? Don't know...

Anyhow, I am pleased with the last two days - my average pace is in the 17:39 range on the treadmill which we all know is faster in real life since my treadmill lies to me. I can see improvement and that helps me to keep going!