Woodson,
Guess I'll add my .02 on this. I do high-intensity cardio interval training 4-5 times a week, usually 30-35 minutes at a time.
You really only need 15-20 minutes to do this and see improvements. Here's what I do. Adjust accordingly.
For a 30 minute workout:
Walk on treadmill at Level 10 or 11 incline and a speed of about 3.5 MPH for about 5 minutes to get warmed up.
As timer counts down to the 25 minute mark lower treadmill to incline level 1 and increase speed up to around 7.5-7.8 MPH.
Run for 1 minute.
As you get down to 24 minutes start gradually lowering speed back to 3.5 and raising incline to 10 or 11. Walk on the incline for 3-4 minutes and repeat run cycle.
Here's the whole workout without in a nutshell:
30-25- walk (incline 10 or 11, speed 3.5)
25-24- run (incline 1, speed 7.7)
24-20- walk (incline 10 or 11, speed 3.5)
20-19- run (incline 1, speed 7.7)
19-15- walk (incline 10 or 11, speed 3.5)
15-14- run (incline 1, speed 7.7)
14-10- walk (incline 10 or 11, speed 3.5)
10-9- run (incline 1, speed 7.7)
9-5- walk (incline 10 or 11, speed 3.5)
5-4- run (incline 1, speed 7.7)
4-0:00- walk (incline 10 or 11, speed 3.5)
Lower incline down to 0 around 1 minute mark
I know this seems complicated in written form but try it out and it will become pretty easy. You could just wait for my book that explains it all. Its entitled: How to do High Intensity Interval Cardio Training 4-5 Times a Week and Remain a Fat Ass. This is 10 times easier to do if you are running outside.
http://www.tnafitness.com/cardio_training/cardio-interval-training-for-melting-away-body-fat/
and stay the hell away from this thread
http://www.madjacksports.com/forum/showthread.php?t=345382