Running faster requires good sprinting mechanics. In order to run quick times you need to get your own sprinting mechanics down to perfection. One of the most important aspects of sprinting is your own body posture. Getting the proper body posture can make or break your own sprinting success. Some people have a natural body posture that allows them to run quick times with ease and others have damaged their technique as a result of improper training over the years.
Just understand that while sprinting you should not run with the same type of mechanics throughout the race. When you're coming out the blocks in the race, you ought have a natural body lean that extends from your own toes all the way to the top of your own head. You must not be bending from the waist while you're coming out the blocks.
This natural body lean have to last about 15 to 20 m during your own sprinting race. When you get to the 20m mark, you ought slowly begin to rise up. This will allow you to make the most out of your own acceleration and it will also keep you from having too drained at the end of those race. Try to imagine a plane slowly rising up from the airway strip. You want to rise up from your own acceleration phase very gradually.
As you begin to come up remember to keep your head right above your own shoulders. This will keep you from leaning forward too much and it will also prevent you from having too much backside mechanics. Just remember to keep your eyes focused at the end of the track and to keep your own head right above your own shoulders.