I finished W4D3 today. Again, the first two days of this week's cycle I didn't completely do without a little extra walking and day 3 was great!
My plantar fasciitis bothered me a little bit on the last 3 minute run so I'm guessing I may need to stretch more before and after.
I'm amazed at how motivated I am to do my runs. I also wouldn't have predicted I'd be up at 5:00 in the morning pumped to hit the pavement! 
Are you all running outside, indoors (track or treadmill)?
I'm mixing it up a bit because it's already hitting 70 degrees at 6 a.m. here in Alabama. HOT and HUMID!