Sprinting is different from endurance running. Very different. In fact, take a look a sprinter and a marathoner next to each other. Sprinters are powerful - big, strong, sculpted. Watch a sprinter run; you'll see their arms pumping, generating extra power, right along with their legs. Contrast that to a marathoner, whose hands glide gently out in front, trying not to waste energy better used by the legs.
Here's a picture of marathoner Deriba Merga (Ethiopia) snapping the tape to win the 2009 Boston Marathon.
Here's a picture of sprinter Usain Bolt (Jamaca), shirt ripped off in frustration after a false start.
He is a strong, powerful, fast man; muscled, chiseled, and without an ounce of fat.
Now let's watch him run. Here's a video of Bolt setting a world record in 100 Meters back in 2009.
Imagine running like Usain Bolt. Arms pumping furiously with every step. Legs pounding the ground one after the other. 10-15 seconds of all-out exertion, leaving nothing in the tank. That's how you should be sprinting - leave everything you've got at the end of each sprint.
Legal Disclaimer (don't blame me):
Warning - I am NOT a licensed physical trainer, therapist, nutritionist, or a doctor. I am a regular guy who just happens to love exercise and fitness.
Exercise can be dangerous if done incorrectly or in excess. I can't see you, and you can't see me, to know if you're doing an exercise incorrectly, which could lead to injury.
Please Please Please seek help / advice / counsel from a local professional before starting a new program, or before doing an exercise you're unfamiliar with. This information is intended as a guide to point you in the right direction. If you aren't familiar with the exercises described herein, I highly recommend seeking professional advice before trying them.