WoW: Cardio & Core Strength Workout

I'm trying to figure out something worthwhile to contribute to this blog. Maybe some sort of weekly series? How's this sound...

My Recommended Workout of the Week

I did this workout today and since it was fun and challenging, I figured I'd throw it on here.
I based the following circuits off a Men's Health article. The idea is that it will improve your cardiovascular fitness without breaking down your fast-twitch/power muscles. Including warm-up and stretching, the workout took me just under an hour.

Circuit I:

5 rounds of:
0:40 treadmill @ 10mph, 10% incline
10 x Over-head squats w/ standard bar
Round 1: 0:40 plank
Rd 2: 0:40 left side bridge
Rd 3: 0:40 right side bridge on right arm 40 sec
Rd 4: 0:40 plank
Rd 5: 0:40 hold bottom of a push-up

2:00 rest

Circuit II:

3 rounds of:
0:40 Mountain climbers
0:20 rest
40 x push-ups
10 x bent-over row w/ standard bar

2:00 rest

Circuit III:

4 rounds of:
1:00 treadmill @ 10mph
5/leg x single-leg rotation squat
Round 1: 85 x crunches
Rd 2: 60 x right side oblique crunches
Rd 3: 60 x left side oblique crunches
Rd 4: 50/side x bicycles