traditional straight punch

When you perform the traditional straight punch you have to ensure the following:
1. Do not bend your body forward. Your body should be straight.
2. Look straight ahead.
3. Do not lock your elbow because this would cause elbow injury.
4. The out and in going fists must rotate along a straight line on their travelling paths. It's like a bullet travelling inside the muzzle of a M16 rifle.
5. Do not tighten your body and fists ...stay relax

Who would use the traditional straight punch in fighting ... I wouldn't .... In the fights that I was involved never once had I use this punch .... However, I think there are other benefits .... which I'll talk about later.