First of all, to find out the reason why Hill Sprints work so extremely well, we have to dissect it and look at what type of exercise it actually is - or what "exercise category" it fits into.
And that category is called HIIT, which stands for High Intensity Interval Training.
That's pretty much exactly what it sounds like, an extremely high intensity exercise performed at maximum capacity in a short period of time (up to 20 seconds) and separated by intervals of say 1 or 2 minutes.
So let's take a look at this specific exercise: Hill Sprints.
First, you can start by warming up for two minutes or so. Maybe a light jog or anything really, just to get some juices flowing.
Then you find the biggest, baddest hill you can find, the steeper the better, hehe.
So once you've gotten to the foot of the steepest and longest (highest) hill in your are... you run up. It's pretty simple.
But again this can't be a teeny jog or something - you have to give it EVERYTHING you got, go running up there as FAST and HARD as you can.
Once you hit the top you'll no doubt be a bit fatigued, if even just a little you still feel it. If you don't feel anything you didn't do it right...
Then you walk down, and the walk is the actual interval.
When you get to the bottom, catch your breath for a bit, but don't get too lazy - your total non-running time can't be longer than two minutes.
After that you just run up again, rinse and repeat.
If you want to find out the exact no-thinking-required 4 Minutes a Day system I used to burn huge amounts of fat in an extremely short time frame, check out my review of it here:
http://bodybotfitnessrobot.blogspot.com
Article Source: http://EzineArticles.com/?expert=Kyle_Frice