Early(ish) 3.2 Miles - with some pickups

To bead the heat/humidity and potential rain that was coming at lunch (and also to get my Yale ID so i can join their gym)....I went out for an early run (for me). I decided to do 1/2 mile "off" 1/2 mile "on" workout to get my legs ready for the Sprint for Dare 5k in Monroe CT on Sunday. My 1/2 mile "ons" were at or around 5k effort. I did three of these...second one was on a slight hill, and the third had some 90 degree turns in it which seemed to slow me down a bit. After the last one - I recovered for a 1/10 of a mile then did another 1/10 at whatever I had left. Here is the damage:
1st 1/2 mile - 3:19
2nd 1/2 mile - 3:26 (up a slight hill)
3rd 1/2 mile - 3:25 (couple turns)
1/10 mile kick - :35 (5:50 pace!)

Total distance: 3.2 miles
Total time: 25:06
Average pace: 7:50
Average HR: 159 bpm
Max HR: 179 bpm
Splits (pace/avg hr/max hr)
7:55 / 153 / 173
7:51 / 158 / 174
7:47 / 165 / 177
1:32 / 171 / 179 (for .2 miles @ 7:35 pace)

http://connect.garmin.com/activity/35528838