http://www.saddoboxing.com/boxing_fo...c,25487.0.html
Have a look at these videos ^

The guy seems nervous or something because he hardly makes sense. reason I posted them is because its often alot easier to show something than it is to explain it. Its a simple enough thing to understand but its can often be harder to translate it across to a forum.

This guy's technique isn't perfect and he could talk through it alot slower and calmer, but just watch the way he uses his body to punch rather than just his arm.