Today was Week 5, Day 2. This one had 2 - 3/4 mile jogs with 1/2 mile walk in between.
I started out at 4.0 and did .5 miles, then with the last .25 miles I dropped down to 3.7 mph. I thought that might be too slow to jog it, but it wasn't. It actually felt like a good pace for me.
I tried running on my middle foot to toe instead of heel to toe, at first it felt really good - almost natural. By the last .25 miles my arches were hurting and my ankle bones, too, for some reason. Not sure if it's because my feet need to get use to running this way or not. Anyways, I know I need new running shoes.
The 2nd 3/4 mile wasn't as bad as the first. I did that one at 3.8 and then dropped to 3.7. My HR only got as high as 144 bpm with each interval.
Oh, and I had dh change the battery in my strap and the thing held my HR the whole workout.

Hopefully that was the problem.
HR STATS:
48 minutes total
7 minutes below zone
20 minutes in zone
22 minutes above zone
364 calories burned
2.5 miles travelled